Amazon.com: Customer reviews: 12% Hydrogen Peroxide Solution - 4 Gallons (Just Food-Grade H2O2 & Water!) - Ecofriendly Natural Cleaning Solution for Kitchen, Bath, Laundry, and Home - HDPE Jug with Child-Safe Cap Made in USA
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Used this to clean my very old tub. Surpassed anything I have ever used and to my surprise it cleaned the drain. I've lived here for 20 years and the tub drain has always been slow. Not anymore,while cleaning the tub a huge brown bubble came up out of the drain. Drains perfectly now and yes I have tried other drain cleaning solutions