Windows require regular care at least 1 time per year. Care includes:
For this purpose:
If functional defets appear, they can be dangerous for people! In this case please do not use the window, close it immediately and contact the nearest sales office.
For window cleaning use sparing, non-abrasive detergent. In case of heavy dirtying (for example, gypsum or mortar remains) clean the window with plastic or wood spatula. Dust and dirt from drainage slot can be removed by vacuum cleaner just open the window frame. Too clogged areas can be cleaned with a wooden or plastic lath.
To ensure the elasticity of seal lubricate it with silicone oil.