Window cleaning Almaty

How stained glass cleaning differs from washing ordinary windows

When a client first considers ordering stained glass cleaning, they often imagine the same process as for regular apartment windows. In reality, the difference is colossal — from water physics to risks for the frames. Let’s break down the key differences that affect the result and safety.

Difference in load on glass and frame

An ordinary apartment window pane is a maximum of 1.5 by 1.5 meters, with minimal load on the frame. Stained glass glazing involves panels from 2.5 to 6 meters in height and up to 3-4 meters in width. Each square meter of glass weighs 10-15 kg, and the total weight of the structure can reach 500-800 kg. When cleaning at height, the pressure on the fastenings increases manifold — and if the force is not calculated, the frame can become skewed. At profi-clean, before every stained glass cleaning job, we check the glazing type: an aluminum profile holds load differently than a wooden euro-beam, and an old Soviet stained glass might not even withstand a professional scraper. In my opinion, the main difference is that stained glass requires calculating weight and wind load, not just “wash and wipe.”

Water supply technology — brush with osmosis vs. bucket

Ordinary windows are washed with a bucket of water and a cloth — dirty water runs off, leaving streaks. For stained glass, this method is detrimental: at a height of 5-10 floors, large drops with dissolved dust and reagents dry faster than you can wipe them off, and they etch into the glass. Professional stained glass cleaning uses a telescopic brush with a reverse osmosis system — water passes through a filter, is purified from hardness salts (Almaty water has many), and is supplied to the brush as distilled water. Such water leaves no streaks even when drying in the sun. Our profi-clean vehicles are equipped with mobile osmosis systems that connect to any tap and provide water with a resistance of 0-5 ppm versus 200-300 ppm from the tap. Without this system, the stained glass will remain with a whitish coating, especially in our climate with dry air and frequent dusty winds.

Cleaning agents — neutral chemicals vs. alkali

For home window washing, people buy Frosch or Mr. Proper — they are alkaline, with a pH of 8-10. They work on ordinary glass, but on stained glass with tinting, mirror coating, or energy-saving layers, alkali eats away the coating in 2-3 washes. Professional stained glass cleaning uses neutral agents with a pH of 6-7 — based on alkyl polyglycosides (APG), which do not damage the coating. profi-clean works with hypoallergenic chemicals from Kiehl and Sodasan — they are biodegradable and leave no film. Additionally, for stained glass with a matte or sandblasted pattern, an even more delicate formula is needed: abrasive particles in cheap products clog the micro-cracks of the matting, and the pattern darkens. In our practice, there was a case where a client washed the stained glass with “Belizna” (bleach) and ruined the matte pattern — the glass had to be replaced.

Safety at height — harness and equipment

Ordinary windows are washed from a windowsill or stepladder — the risk of falling is minimal. Stained glass structures on facades and in atriums require industrial mountaineering. The difference here is not in complexity, but in mandatory safety elements: a harness system with two independent anchor points, carabiners with EN 361 certification, Petzl or Kong descenders. In Almaty, wind on upper floors reaches 15-20 m/s, and during a gust, the cleaner must be secured so as not to fall even if balance is lost. profi-clean uses only certified equipment that undergoes annual inspection by the Ministry of Emergency Situations. Before every stained glass cleaning job, we check the wind forecast — at speeds above 12 m/s, work is postponed because the wind can press the climber against the glass or, conversely, throw them away from the facade. This is not safety for the sake of a checkbox — it’s the difference between life and injury.

Impact on adjacent surfaces — facade and flashings

When washing regular windows, water runs onto the windowsill and drip cap — they are wiped down, and that’s it. When washing facade glazing, water with chemicals runs down aluminum panels, porcelain stoneware, and sandwich panels. If runoff is not controlled, alkaline residues eat into facade materials — especially porous clinker brick and natural stone. Before washing facade glazing, our cleaners lay moisture-proof rolls along the bottom drip cap and use water collectors — special funnels that collect runoff and divert it into the sewer system. Without this, whitish streaks appear on the facade within six months that cannot be washed off with plain water. Moreover, on the south side of the building, under the sun, the chemicals react faster — salt stains form within 2-3 hours if not rinsed off immediately. That’s why at profi-clean we always wash facade glazing in cloudy weather or in the morning when the glass is not heated — this gives time for runoff control.

Specifics of Facade Glazing Contaminants in Almaty

Facade glazing in Almaty faces a unique set of pollutants not found in coastal or plains cities. We’ve broken down exactly how the local dust differs, why the buildup on southern facades is more aggressive, and how often facade glazing actually needs to be washed to maintain transparency.

Dust Load and Wind Regime of Almaty

Almaty dust is not just quartz sand, but a complex mixture: 30-40% consists of soil particles mixed with cement dust from construction sites, another 20-25% are exhaust gases settling as an oily film. Due to the city’s basin location in calm weather (about 150 such days a year), fine particulate matter PM2.5 and PM10 hangs in the surface layer up to a height of 15-20 meters — exactly where most facades of business centers and residential complexes are located. The wind regime exacerbates the situation: mountain-valley winds (gornyak and ileets) blow dust from the western and southwestern sides, so facades facing Abay and al-Farabi avenues become covered with buildup 2-3 days faster than glazing in courtyards. At heights above the 7th floor, particles remain suspended longer — the dust there is finer, penetrates deeper into the micropores of the glass, and forms a matte layer faster that plain water cannot wash off. In our practice, facades on southern sides require washing 40-50% more often than those on northern sides, with the difference noticeable within a week after cleaning.

Seasonal Pollutants: Poplar Fluff, Pollen, and Smog

In spring and early summer, the main enemy of facade glazing is poplar fluff, which flies in Almaty from late May to mid-July. The fluff contains natural oils and gluten: sticking to the glass, it leaves a sticky residue that turns into a crust within 24-48 hours, attracting additional dust. If such buildup is not washed off within 3-5 days, it eats into the surface and requires the use of special alkaline compounds. In autumn, wormwood and ragweed pollen is added — its concentration in Almaty’s air in September reaches 50-70 grains per cubic meter, which is 2-3 times higher than the average for Kazakhstan. Pollen settles on vertical surfaces and, when wet (dew, fog), forms an acidic film with a pH of 5.0-5.5, which slowly corrodes the lacquer coating of aluminum frames and tinting film. In winter, road reagents — salt and sand — are added to the contaminants, which the wind throws onto the lower 5-6 floors. During temperature fluctuations (thaw during the day, frost at night), these particles freeze into micro-damage on the glass and can leave scratches during mechanical cleaning. Therefore, the seasonal frequency of washing should change: once every 10-14 days in May-July, once every 3-4 weeks in the autumn-winter period, and mandatory extra washing after dust storms (Almaty experiences 2-3 such days per spring).

Impact of Industrial Zones and Proximity to CHP Plants

The location of a property relative to industrial zones and thermal power plants fundamentally changes the nature of the dirt. Within a 2-3 km radius of CHP-1 (Zhetysu District), CHP-2 (Alatau District), and CHP-3 (Bostandyk District), soot and unburned hydrocarbons settle on stained glass — this is a greasy black coating that cannot be removed with regular detergents. In the areas of the Cement Plant (Koktobe microdistrict) and AZF (Almaty Phosphate Salts Plant in the vicinity), the dust contains alkaline and acidic components: when moistened, it forms an aggressive environment that can make glass matte in 2-3 months if not washed every 2 weeks. For owners of stained glass in industrial zones, we recommend using protective hydrophobic coatings — they reduce the rate of dirt absorption by 2-3 times and extend the interval between washes. At properties in ecologically cleaner areas (Medeu sector, Gorny Gigant microdistricts, Kamenskoe Plateau), the main pollutant is ordinary dust, and washing once a month provides consistently clear glass without traces of chemical impact.

Typical mistakes when trying to save on washing

The most common mistake made by stained glass owners in Almaty is trying to wash windows with water mixed with regular dish soap or aggressive household chemicals. Alkaline compositions (pH above 9) leave micro-streaks on the glass, which, when dust settles, become anchors for new deposits — after 3-4 such washes, the glass acquires a persistent gray tint that cannot be removed without professional polishing. The second mistake is washing in sunny weather: water evaporates faster than the cleaner can remove the solution, leaving salt streaks on the glass that are visible at certain angles and spoil the overall look of the facade. The third, and most expensive, mistake is using metal scrapers or hard abrasive sponges to remove dried cement mortar or construction film. In Almaty, such cases are especially common in new buildings (residential complexes “Nurly Tau”, “Akbulak”, “Triumph”), where developers save on professional cleaning after project handover. Scratches from abrasives on tempered glass cannot be removed — the glass must be replaced, while on regular glass they require expensive polishing with diamond pastes. For stained glass in new buildings, we always recommend calling a professional team before the dried mortar firmly bonds with the surface — this saves up to 70% of time and eliminates the risk of glazing damage.

How often should stained glass be washed: profi-clean recommendations

Unlike regular windows, stained glass does not have a single washing schedule — the frequency is dictated by the building type, glazing orientation, and seasonal load in Almaty. Based on eight years of practice, we have derived three basic modes: basic, enhanced, and premium maintenance.

Basic mode: once every 3–4 months for residential complexes

Stained glass glazing for apartments and townhouses in Almaty only needs washing three to four times a year — this is enough to remove standard dust and rain streaks. In homes in Medeu and Bostandyk, where stained glass faces south, deposits settle faster due to dry air and insolation — here the interval is reduced to two and a half months. On northern facades, in the Alatau district, the dirt film is thinner but lasts longer: three washes per season are sufficient. The main indicator is a visible layer of dust that begins to distort light transmission: if streaks remain on the glass after a regular dry cloth wipe, it’s time to call the cleaners. In our practice, orders for the basic mode most often come from residents of residential complexes “Akbulak” and “Grand Alatau” — owners of panoramic windows know for sure that twice a year the glass loses up to 15% of transparency, and this is noticeable to the naked eye. With this schedule, the stained glass retains its factory shine without abrasive wear of the coating — provided, of course, that the washing is done with a professional squeegee, not a sponge with “Fairy”.

Enhanced mode: monthly for offices and retail spaces

On commercial stained-glass windows — in the “MEGA” shopping center, “Almaty Towers” business center, and the “Esentai Mall” shop windows — dirt accumulates much faster: construction dust, exhaust fumes from Al-Farabi Avenue, visitor fingerprints, and bird droppings. We recommend washing such stained-glass windows monthly, and during the active construction season (April–October), every three weeks. It’s not just dirt that settles on the glass, but a fine suspension of cement dust: it eats into the micropores of the glass within 10–14 days, and if a cycle is missed, removal will require chemicals with abrasive particles that scratch the stained glass. Our contracts with office centers mandate the obligatory cleaning of seals and drainage holes — a clogged drain causes water stagnation, and in the sun, the water evaporates, leaving limescale. On the shop windows of clothing stores on Zhibek Zholy, we wash the glass at least twice a month: greasy fingerprints from door handles and droplets from air conditioners create a “foggy screen” effect that repels customers. The enhanced regime saves the owner’s budget: monthly preventative maintenance is cheaper than a one-time deep clean after a year of neglect.

Premium regime: every 7–10 days for restaurants and exhibition halls

On the stained-glass windows of restaurants with open terraces — “Bastau”, “Terrace on Kok-Tobe” — and in art galleries on Kurmangazy, the glass must be impeccable 24/7. Here, the washing interval is 7–10 days, and during the rainy season (October–November), every 5 days. Restaurant stained-glass windows become coated with a thin grease film from kitchen equipment operation: the oily residue attracts dust, and within three days after washing, the glass looks dull. For such facilities, we use a degreasing pre-spray based on citrus solvents — it breaks down grease without streaks, and the final pass is done with distilled water to prevent salt residue. In exhibition halls, where stained-glass windows are part of the display, not only cleanliness but also an antistatic effect is important: our Sodasan finishing chemical creates an ionic lattice on the glass that repels dust for 5–7 days longer than standard products. Before signing a premium service contract, we always visit the site and measure the contamination level with a spectrophotometer — the difference in light transmission between clean glass and three-day-old glass can reach 8%, and restaurant owners see this difference in reduced evening check averages.

Seasonal adjustments: what changes in Almaty

In spring and autumn, the city experiences active blooming and leaf fall — poplar pollen, small leaves, and seeds settle on stained-glass windows. In April–May and September–October, we recommend reducing the interval between washes by 10–14 days relative to the base schedule: pollen mixed with morning dew forms a sticky film that, when dry, turns into stains that cannot be washed off with plain water. In winter, at sub-zero temperatures, stained-glass windows get dirty more slowly, but a problem with de-icing reagents arises: anti-icing mixtures spreading from roads settle on the lower sections of the stained glass and, during a thaw, leave a white residue. At facilities near Abay Avenue and Timiryazev Street, we record up to 30% faster contamination of lower glass panes in winter — there, washing once every two months is sufficient, but necessarily with an alkali neutralizer, otherwise salt streaks eat into the aluminum profile. In new buildings on the outskirts, where finishing work on neighboring houses is still ongoing, construction dust flies onto the stained-glass windows year-round — here, we recommend maintaining an enhanced regime for the first six months after occupancy, and then switching to the base schedule if construction is complete.

Which stained-glass windows require a special approach

Not all stained-glass windows are washed the same way — the design, frame material, and type of glazing dictate their own technique. A mistake at the assessment stage often leads to streaks or damage to the seals, so before departure, we classify the facility according to three criteria.

Panoramic stained-glass windows with aluminum profile

An aluminum frame is the most common option in Almaty business centers and new buildings, but it requires control of the cleaning agent’s alkalinity. When aluminum comes into contact with aggressive chemicals (especially those containing soda), an oxide film forms within 2-3 cleaning cycles — the glass begins to appear hazy, although the deposit is not on the glass itself, but on the profile. We use pH-neutral formulations from Sodasan and Kiehl with a buffer index of 6.5–7.5, which do not react with the anodized coating. In our practice, there was a case at the “Nurly Tau” business center: after three cleanings by an uncertified cleaning service, the profile became dull, and we had to manually polish each section with a cerium oxide-based paste. Abrasive sponges and hard scrapers are prohibited on aluminum stained-glass windows — micro-scratches on the frame are visible from a distance of 3 meters under side lighting.

Facade stained-glass windows with thermal insulation (double-glazed windows)

Double and triple-chamber double-glazed windows are the main type of glazing for business-class residential complexes in Almaty, and the airtight seal around the perimeter is critically important. When cleaning facade stained-glass windows from the outside, water with cleaning solution must not enter the joint between the glass and the spacer frame — if the sealant has already begun to age, moisture penetrates inside the unit, and after 2-3 months, irremovable condensation appears between the panes. We check the integrity of the seal before starting work: when pressure of 2-3 kg is applied to the joint, it should not compress by more than 1 mm. For such windows, we only use microfiber with 40% moisture content (wrung almost dry) and squeegees with a 30° angle so that water runs onto the frame, not into the joint. At the “Triumph” residential complex on Nauryzbai Batyr Street, we analyzed a situation: a client tried to clean the windows themselves with a mop using strong pressure — moisture got into the bottom joint, and a month later the double-glazed window fogged up from the inside, requiring a block replacement.

Stained-glass structures with laminated and frosted glass

Laminated glass (triplex) and frosted glass with a sandblasted pattern require a different technique than clear glass — any streaks are visible on them, and mechanical impact leaves irreversible marks. On frosted stained-glass windows in offices (partitions with film coating or acid etching), we never use scrapers — the blade strips off the frosted layer in one pass, and it cannot be restored, only the glass can be replaced. For triplex, pressure is critical: with a force of more than 5 kg on the squeegee, micro-bubbles can appear between the laminate layers, especially on older panels (5+ years of use). At the “Alasha” restaurant on Dostyk Avenue, we had an order to clean stained-glass windows with an original frosted pattern — we only worked with a Karcher steam machine with a blade attachment at a distance of 15 cm from the surface to avoid damaging the texture. On laminated stained-glass windows at the “Ak Kent” residential complex, we use a silicone squeegee (not rubber) with microfiber underneath — silicone is softer and does not leave scratches on the laminate.

Stained-glass windows of complex geometry: arched, triangular, with radius bends

A non-standard stained-glass window shape is not an aesthetic detail, but a factor that extends cleaning time by 1.5–2 times and requires individual templates for the squeegee. On arched stained-glass windows at the “Mega” shopping center (radius 2.5 meters), a regular straight squeegee does not work — water remains at the top point of the arc, and after 15 minutes, limescale streaks form. We use telescopic poles with a 180° rotating tip and rubber squeegees with a radius blade — these are custom-ordered for specific projects. For triangular stained-glass windows at the “Almaly” business center (glazing angle of 30°), we had to make three squeegee passes on each section because the frame angle did not allow the blade to be drawn in one motion. If the stained-glass window has a radius bend in two planes (a dome or bay window), we assign two cleaners to the site — one holds the pole tangentially, the other adjusts the squeegee tension. In such structures, using water with impurities is strictly prohibited — hard Almaty water (8-9 mg-eq/L) leaves a salt arc along the bend line, which can only be removed with an acidic compound with an exposure time of 3-5 minutes.

Stained-glass roofs and skylights of atriums

Horizontal or slanted stained glass windows (domes, winter gardens, atriums) are cleaned fundamentally differently than vertical ones — water doesn’t drain by gravity but stagnates in lower points, and any mistake in technique leaves visible streaks within 20 minutes after drying. On the stained glass roof of the “Asia Park” shopping mall, we work in two stages: the first pass uses a steam cleaner (120°C) followed by condensate collection with a vacuum squeegee, the second is a final polish with an antistatic microfiber cloth to prevent dust from settling on the wet glass. A critical nuance is the temperature difference: if it’s +5°C outside and +25°C inside the atrium, condensation forms on the glass, mixing with the cleaning solution and reducing its effectiveness. In such cases, we start cleaning from the outside at 7 a.m., before the building warms up, and the inside two hours later, once the condensation has evaporated. On the skylight of the “Almaty Towers” business center last year, we used biodistilled water (TDS 5 ppm) — regular tap water left a whitish film on the horizontal surface within an hour, which had to be washed off again with an acetic acid solution.

Why you shouldn’t skimp on professional stained glass cleaning

Saving money on stained glass cleaning through non-professionals or “generalists” leads to hidden losses that far exceed the cost of quality service. We break down the three main pitfalls of a cheap approach — using specific Almaty cases.

Streaks and lines from cheap chemicals and incorrect squeegees

The cause isn’t “dirty water,” but the incompatibility of household products with stained glass. Window cleaners from supermarkets contain ammonia and alcohols, which leave a hard-to-remove film on large panes — under the Almaty sun, this creates rainbow streaks visible from 10 meters away. On M1 glass and float glass, microscopic particles of undissolved concentrate settle as crystals after such treatment, creating a “fogged” glass effect with temperature changes. The second scourge is a squeegee with a dull blade or incorrect angle: instead of one pass, the worker makes 3-4, leaving scratches on tempered glass. On matte and tinted stained glass, these scratches become white lines that nothing can remove. We always have a set of blades in stock for specific glass types — a 45° angle for float glass, 30° for laminated glass. Before ordering, ask to see what squeegee and chemicals will be used — if you hear “Fairy and water,” be prepared to redo the cleaning.

Damage to seals and frames from aggressive chemicals

Rubber seals and aluminum frames of stained glass are the most vulnerable elements, which don’t tolerate acidic or alkaline compounds. Cheap products with a pH below 3 or above 11 destroy EPDM rubber in 2-3 cleanings: it cracks, loses elasticity, and dust and moisture begin to blow in through micro-cracks. Aluminum profiles, under the influence of chlorine-containing compounds, develop a white oxide film — this isn’t dirt but a chemical reaction that can’t be reversed. In Almaty, with temperature swings from -20°C in winter to +40°C in summer, a damaged seal causes condensation inside the double-glazed unit within a month. We only use hypoallergenic chemicals from Kiehl and Sodasan with a neutral pH of 6.5-7.5 — they don’t affect rubber or aluminum but effectively remove bitumen and soot. In our practice, there was a case at the “Nurly Tau” business center: after three cleanings by “generalists,” the seals had to be replaced on the entire facade — 12 linear meters, costing the owner 280,000 tenge for replacement versus 45,000 tenge for a year of cleaning with us.

Health risks and unsanitary conditions from uncertified cleaning

Stained glass windows in offices and shopping centers are accumulators of pollen, mold spores, and bacteria that are invisible to the eye but become airborne during any cleaning. Without an industrial vacuum cleaner with a HEPA filter and antibacterial agents, allergen particles remain on the glass and frame, and when dry, they disperse throughout the room. In Almaty, where during the poplar and ragweed blooming season the pollen concentration reaches 800-1200 units/m³, non-professional cleaning without filtration turns cleaning into allergen dispersal. Mold on silicone joints is another hidden threat: its spores penetrate the ventilation system and colonize an office within 2-3 weeks. At every site, we use an industrial Nilfisk vacuum cleaner with HEPA H13, and after cleaning, we treat the joints with an antifungal compound based on benzoic acid — it is safe for people but kills 99% of spores. If you are offered stained glass cleaning without specifying the vacuum cleaner brand and chemical certificates, you risk getting not cleanliness, but chronic coughing among employees. Our 24-hour result guarantee includes checking not only the cleanliness of the glass but also the absence of chemical odor and dust film on the frame.

Hidden defects that cheap cleaning masks

An unprofessional cleaner washes over cracks, chips, and micro-scratches, making them invisible for a day or two, but without eliminating the cause. When glass is cleaned with a wet rag without prior dust removal, sand and abrasive particles are rubbed into the surface, deepening existing scratches. On stained glass with energy-saving coating (Low-E), this approach erodes the thin layer of silver oxide — the glass loses 15-20% of its thermal insulation, and in winter, you get a cold floor near panoramic windows. At every site, we pre-inspect stained glass with an ultraviolet flashlight — under UV light, micro-damages that are not visible in daylight become apparent. If we find a chip or crack, we draw up a report and recommend replacement before cleaning — this prevents situations where the client blames the cleaner for damage, even though the defect was pre-existing. A good service always takes “before” photos and records the condition of the frame — this protects both parties. Before ordering, ask if a preliminary inspection with documentation is conducted: if not, you risk a dispute over an old defect that a “handyman” simply washed over temporarily.