Why Window Cleaning Is Not One-Size-Fits-All
Commercial window cleaning involves more than a bucket of soapy water and a squeegee. The height of the building, the type of glass, and the condition of the frames all affect how the job should be done. A single-story storefront with sliding glass doors requires different equipment and techniques than a multi-story office tower with fixed-pane windows. The cleaning crew must have the right ladders, poles, lifts, or scaffolding to reach every pane safely.
The type of glass also matters. Low-e glass, tinted windows, and mirrored glass each require specific cleaning solutions to avoid damage. Ammonia-based cleaners can strip the coating from low-e glass, leaving it vulnerable to UV damage. Abrasive pads or dirty squeegee blades can scratch mirrored glass permanently. The reader should ask any potential window cleaning firm what methods they use for different types of glass and whether they will test a small area first before proceeding with the full job.
Safety Practices and Equipment
Window cleaning at height carries real risks. The crew should be trained in ladder safety, fall protection, and the proper use of any lifts or scaffolding. Ask the firm whether they use safety harnesses and lanyards when working above ground level, and whether they have a written safety plan. For multi-story buildings, the crew should use a water-fed pole system that allows them to clean windows from the ground, eliminating the need for ladders or lifts altogether.
The equipment itself should be well-maintained. Squeegees should have sharp, clean rubber blades that are replaced regularly. A dull blade will leave streaks and can scratch the glass. The water used for cleaning should be purified, especially if the crew uses a water-fed pole system. Tap water contains minerals that leave spots on the glass as it dries. A professional firm will use a reverse-osmosis or deionized water system to produce spot-free results. The reader should ask to see the equipment and verify that the company maintains it properly.
What the Job Should Include
A thorough commercial window cleaning includes more than just the glass. The crew should also clean the window frames, sills, and tracks. These areas collect dust, pollen, and debris that can be blown back onto the glass after cleaning. They should also wipe down the interior and exterior of the glass, unless the contract specifies only one side. The reader should ask whether the price includes cleaning both sides, and whether the crew will remove any stickers, decals, or adhesive residue from the glass.
The frequency of cleaning depends on the location and the use of the building. A storefront on a busy street may need cleaning every two weeks to maintain a professional appearance, while an office on an upper floor may only need it quarterly. The reader should ask the firm for a recommended schedule based on the building's exposure to dust, pollen, and bird droppings. A good firm will provide a written estimate that lists exactly which windows will be cleaned, how often, and what the cost covers.
How to Compare Quotes and Firms
When comparing quotes, look beyond the bottom line. A lower price may mean the crew will skip the frames and sills, use tap water instead of purified water, or use a less thorough method that leaves streaks. Ask each firm for a detailed breakdown of what is included. Also ask about their insurance. The firm should carry general liability insurance and workers' compensation insurance to protect you in case of an accident or damage to the building.
Ask for references from other commercial clients, especially those with similar buildings. Call those references and ask about the crew's punctuality, how they handled any issues, and whether the windows stayed clean for a reasonable amount of time. Also ask about the firm's policy on weather. Rain can ruin a window cleaning job, so the firm should have a clear policy on rescheduling due to rain or high wind. The reader should get everything in writing, including the scope of work, the schedule, and the payment terms.
After the Job: Checking the Work
Once the crew finishes, inspect the windows before they pack up. Look for streaks, smudges, and spots. Check the corners of the glass for water residue or dirt that was not wiped away. Run a finger along the window frame and sill to see if they were cleaned. If the crew used a water-fed pole system, check for water spots on the glass or on the building's exterior walls. A good crew will correct any issues on the spot without extra charge.
Also check the interior for any water or cleaning solution that may have dripped onto the floor or furniture. The crew should have laid down drop cloths or towels to protect the interior. If they did not, and there is damage, the reader should document it and contact the firm immediately. A professional window cleaning firm will stand behind their work and return to fix any problems. The reader should keep the written contract and any correspondence for future reference. Phoenix Commercial Cleaner Pros offers window cleaning as part of its commercial cleaning services.