Q: My old toilet has black stains where you see water, not on the sides of the bowl. I have tried using Zep Acidic Toilet Bowl Cleaner with no luck. Also, I have tried chlorine and other toilet ...

THE GOOD NEWSÂ The good news is that it’s easy to remove the black stains no matter if they’re mold, mildew or the algae. I would highly recommend that you use an oxygen bleach solution to ...

Q: When we took up the rubber mat in my son's fiberglass bathtub, we discovered black stains. Efforts to clean with mold and mildew remover and Soft Scrub with bleach had no effect. The tub was ...

Mold and mildew need water to flourish. The black stains you see could be an accumulation of the dead, dark-colored cells of the hardy algae Gloeocapsa magma, which feeds on the calcium carbonate ...

Q: When we took up the rubber mat in my son’s fiberglass bathtub, we discovered black stains. Efforts to clean with mold and mildew remover and Soft Scrub with bleach had no effect. The tub was ...