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 ...

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 ...

Zep Mold & Mildew Stain Remover will also take mildew stains off the AC vents. Place newspaper and plastic underneath the stained vent and spray on the Zep and just let it dry.