Correct cleaning items:
Use a soft, clean cloth, but never abrasive agents such as sponge cleaners or microfiber cloths.
Do not use any steam cleaners, as the heat can damage the shower.
Use only mild detergents, such as those based on citric acid. Do not use any cleaners that contain hydrochloric acid, formic acid, chlorine bleach or acetic acid, as these can cause serious damage.
Detergents that contain phosphoric acid should only be used in a limited way. Do not mix detergent! Never spray the cleaner directly on the shower as the spray can get into the shower and cause damage.