Independent test results demonstrate that bacteria will not feed and survive on the sponge fibers of estracell sponge material... naturally!.The unique cell structure rinses cleaner and dries out faster eliminating the perfect breeding condition for bacteria and fungal growth.a. These qualities make estracell more sanitary!. Brillo® is donating 5 cents from this purchase to The Breast Cancer Research Foundation® up to a maximum of $50,000. Wedge Edge® reaches deeper.Limited warranty to consumers replacement or refund if defective. No-scratch scrub material is designed to clean delicate surfaces including non-stick cookware, glassware and counter tops. Some plastic and painted surfaces may be damaged by abrasives.