• Use mild detergents.
• Persistent stains that are difficult to remove with regular cleaning products should be removed carefully with a glass scraper.
• Stains such as glue and paint are best removed with xylene, which is available from paint stores and large retail stores. Acetone (e.g. nail polish remover) is slightly stronger and more effective for removing paint stains.
• These solvents should not be used on wood or aluminium parts – do not let the solvent run over these surfaces when using it on glass.
• If solvents are used, the window must be washed again immediately with water.
• During construction, any rendering material or concrete must be removed from the glass without delay. Use plenty of water, a mild alkaline detergent solution or xylene.
Do not rub stains or attempt to remove them dry.
Cleaning and maintenance of coated glass
Applies to the following products: self-cleaning Activ glass, K glass (selective) and FrostFree glass
• Avoid using hard abrasive tools (e.g. scrapers, steel wool). Mechanical abrasion can damage the surface beyond repair.
• Avoid touching the glass with any kind of metal
• Avoid using chemicals that may damage the coating permanently
• Use of strong acidic or alkaline products is prohibited
• Avoid washing the glass in direct sunlight
The following points should be taken into account in the maintenance of fire-rated windows (compartmentalising windows EI30 and EI15 / E30): If the expandable fire seals of the frame or the insulation glass become damaged, they must be replaced with equivalent products. It is best to check this with the manufacturer. Seals should be left in situ when washing windows or touching up the paintwork. Large (over 1m²) fire-rated windows must be braced when opened for cleaning. In fire-rated windows the glass is much heavier, which is why relatively smaller windows must also be braced.