• Use mild detergents.
• If the glazing contains stains which cannot be removed using normal detergents, it is recommended that these stains be removed carefully with a glass scraper.
• We recommend that xylene be used to remove the glue, paint or other similar types of dirt. It is available for instance in paint shops and well-equipped department stores. Acetone is another, slightly stronger detergent (used for instance to remove nail polish) which removes paint more effectively.
• Do not use these products to clean the painted surfaces of wooden and aluminium elements. When cleaning glass, you should be careful not to let these substances spill on painted surfaces.
• After the use of solvents mentioned above, windows must be cleaned again with mild detergent and water.
• The putty material/concrete attached on the glazing surface at the construction stage should be cleaned immediately. Plenty of water, a mild alkaline liquid detergent or xylene for soaking should always be used for cleaning.
• Do not scrub or try to remove dry dirt.

Considerations for maintenance and cleaning of surface-treated glazing (applicable to self-cleaning Activ glazing, K-glazing (selective) and FrostFree glazing)

• Avoid hard cleaning tools (e.g. scrapers, steel wool). The mechanical scrubbing of glass may result in irreparable surface damage.
• Avoid all contact between glass and metal objects.
• Avoid the use of all chemicals which may permanently damage the surface treatment.
• The use of strong acidic or alkaline substances is prohibited.
• Do not clean glass under direct sunlight.