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When I heard they were being discontinued, I think I bought up every available case on the West coast :-)Sorry, even with that, I'm almost out of stock.The Tub Rub cleaning pad can be used with or without liquid cleaning solutions and is designed for fast, safe and effective cleaning of spa and hot tub surfaces. The Tub Rub does not affect spa or hot tub chemistry. Use the Tub Rub as a cleaner, or as an applicator for surface maintenance products. The wetter the pad the better the cleaning action. Quickly cleans scum lines, grime, and scale on spa and hot tub surfaces. Use on tile, fiberglass, acrylic, Quarite, chrome, ceramics, stainless steel, plastic and more! Contains all natural ingredients and leaves no residue. Completely child safe. Measures 4" x 4".