Post-construction window cleaning

glass scraper for post-construction window cleaning

Post-construction window cleaning

Every good contractor does a post-construction window wash before delivering the final result of his project to the customer.

After construction, windows are often splattered with paint, silicone, mortar and plaster debris. Even the smallest jobsite leaves windows that need special care. Post-construction window cleaning requires more expertise, specialized tools and greater attention to detail than regular window washing. The risk of scratching the glass is very high, and you need to remember to select the right tools to clean the glass without damaging it.

Tempered glass is particularly sensitive to scratches. The composition of the glass and the microscopic manufacturing defects mean that scrapers will scratch this type of glass. Tempered glass is tedious to clean, requiring manual brushing to remove paint and debris.


Specialized techniques to avoid scratched windows

Our tools



  • Glass scraper
  •  professional
  • Stainless steel scraper blades
  • 0000' steel wool, the world's best quality steel wool that won't scratch glass
  • Goof Off ™ to remove sticker residue
  • 3M ™ scratch-free scouring pads
  • Acid to break down and remove dried concrete and mortar

Chemicals and detergents


We use detergents and surfactants to lubricate the scraper blade, allowing it to glide over the glass. These lubricating detergents create a thin protective layer between the metal scraper blade and the glass surface being scrubbed.
Our detergents are commercial-grade concentrated detergents designed to loosen grease and dust and keep them in suspension for easy and effective removal.


How we remove these substances from glass during a post-construction window wash

Dried concrete and mortar 


To remove dried concrete from glass, we use hydrochloric or muriatic acid to break up the dried concrete. The silica in the concrete bonds chemically with the silica in the glass surface, making it difficult to remove. Acid is used to chemically break these bonds so that concrete and sand particles can be rinsed away without dragging them onto the glass surface. Care must be taken to ensure that this acid does not run onto mortar pavements or fall onto concrete sidewalks and cause discoloration.

How to remove window stickers


We remove manufacturers' stickers by first soaking them with water and detergent to soften the paper and adhesive. Our detergent contains smoothing agents to help scraper blades glide smoothly over the glass. Ideally, the scraper blade should glide over a thin layer of water and not touch the glass at all. Once the sticker has softened, we carefully use a stainless steel scraper blade designed for use on glass to remove the sticky residue from the pane.


How we remove silicone and vinyl residues from glass


Les fabricants de fenêtres ou les travailleurs scellent les fenêtres dans leurs cadres à l’aide de silicone et peuvent parfois laisser des traces de silicone sur le verre. Le silicone est une des principales substances difficiles à retirer du verre, mais avec un peu de graisse à bras, c’est possible. Pour éliminer le silicone, nous nous débarrassons d’abord de tous les gros globes à l’aide d’une nouvelle lame de grattoir, puis frottons toute la surface du verre dans un mouvement de polissage particulier avec de la laine d’acier « 0000 ».


How we remove dried paint from glass and windows


Dried paint should be removed with a blade. The blade should be inspected and changed often as the glass will eventually dull the blade and damage in the blade could damage the glass. We recommend 6″-wide stainless steel scraper blades because they don't rust and stainless steel is softer than carbon steel blades. The ones we use are thinner than a sheet of paper and are very flexible.


In conclusion


Washing windows after construction requires special tools and techniques. Call on professionals like those at Vitres Ultra Nettes to make sure you get the job done right.

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