How to use a scraper blade when cleaning windows
When is a scraper blade needed?
The following situations would likely require the use of a scraper blade.
- After construction or decorating work has been carried out.
- Stubborn dirt or stains such as egg, bird excrement or splashes caused by pressure washing.
- When adhesive tape, vinyl lettering or stickers need removing.
- The first time windows are cleaned after many months or years.
Checks to carry out before using a scraper blade
Scraping glass with a scraper blade can damage the glass. Certain kinds of glass are more susceptible to scratches than others.
- Check if glass is scratch resistant and suitable for scraper use. (It is not recommended to use a scraper on Plexiglass, crown glass, solar glass, safety glass (ESG) etc.
- Follow the manufacturer’s care instructions.
- Perform a scrape test in advance on a hidden section.
- Before starting work, check the glass for damage and report it if necessary.
How to use a scraper blade correctly
- Never use a glass scraper on dry glass.
- Always use the blade on a wet surface.
- It is best to use with a soapy cleaning agent. This lubricates the blade and makes it easier to see where you have passed the blade (think of it a bit like shaving a beard!)
- Always scrape in one direction! Never pull the scraper back. (Dirt accumulated on the blade can be trapped under the blade and pulled over the surface of the window causing scratches.)
- Apply even pressure holding the blade flat against the glass. The corners of the blade can cause scratches.
- Change or reverse the blade if it becomes blunt, rusty or chipped.
- Clean the blade regularly by swishing it about in a bucket of water.
- Do not keep an open blade in your work pouches. Always replace the cap or retract the blade for your protection.
It is a good idea to ask the customer to sign a Scratch Waiver Form. (This is basically a simple form which states that you do not accept responsibility for any scratches that occur and that the customer understands that the task does carry an element of risk.)