About my shower over some time towards small black spots had formed - I came via Google on the WEPOS Mildew and thought to myself, with the many positive reviews I can not do much wrong. So I have the affected areas sprayed, leave for 15 minutes and rinse with fresh water. The result is good! No mold, no stains - the wall looks like new! Also criticized the strong chlorine smell I found not so bad - after two hours of airing it was almost impossible to smell.