Valterra V23500 Pure Power Toilet Bowl Cleaner Bottle - 24 oz. (Quantity 4) Go to amazon.com Related posts 11 best rv toilets porcelain for 2022 FeatureUsed For: Porcelain/ Plastic Toilet To Remove Hard Water Build UpUnit Type: BottleRemoves Hard Water Build UpEffective Without Harsh Chemicals DescriptionToilet Cleaner; Pure Power; Used For Porcelain/ Plastic Toilet To Remove Hard Water Build Up.