31 Overachieving Product Reviewers Say They’d Use ‘Forever’

Promising review: “I was skeptical at first, but after one use, I became a believer. I moved into an apartment where both toilet tanks had what looked like black mold, mineral deposits, and rust. Every time we cleaned the toilet, I tried several products, even Drained the tank and tried to clean it, and nothing worked, after one treatment, only half a bottle per tank, and the tank was completely clean, as white as it could be with rust and metal spots I will continue to buy this product forever —!advertisement

Get it from Amazon for $7.07.