All QUEMME products are made with high quality and easy-care materials. Clean doors and windows is a common hygienic and aesthetic standard, but at the same time it's the basic operation of maintenance, because it preserves the protective coating. It's important to keep cleaned doors and windows, especially in towns, because - similarly to acid rain -  smog and dirt cause the formation of acids that erode the surface of the fixture. Particularly in coastal areas, the presence of salinity in the air (transported by the sand) easily attacks the fixture (both wood  and metal components). Neutral detergents and water are to use to clean these products , avoiding harsh detergents that can damage the surface. Take care not to use any ammonia or alcohol which could cause irreparable damage to the coating film surface. The glazing can be cleaned with appropriate products available on the market.