Liquid Formula For Deep Penetration - Unlike powders or tablets, our liquid formula flows through every pipe and jet, dissolving buildup you can’t see but definitely feel. | One Deep Clean Cycle Every 3 months - Just one 15-minute cycle every 3 months keeps your tub protected and fresh, preventing black flakes, soap scum, and residue. | Scientifically Formulated & Lab Tested - Engineered and validated in lab and field testing. Targets body oils and soap buildup, breaking down hidden grime that clouds water and strains equipment. | Visible Results You Can trust - Watch hidden grime and black flakes flush out before your eyes. Proof that Oh Yuk cleans deep inside your tub where others simply can’t reach. | Made In The USA - Proudly formulated and bottled in USA. Each 16 oz bottle delivers up to four deep cleanings-enough to keep your tub fresh for a full year. Safe, effective, and reliable.