Cleaning bathroom grout - list shows the best home remedies for black stains. vinegar kills the mold while bleach lightens the black discoloration.
If you don't want to resort to expensive mold removal from the drugstore, you can simply use vinegar and bleach. If there is a black film on the joints in the shower, then it is mold. Tiles and joints are warm, the room is warm and soap residue also provides a good breeding ground for spores. The bathroom is a room in which a humid climate prevails. Dust, water and lime quickly accumulate in the recessed tile joints.