Scrape Off Gunk With Ease -- Tired of dirty fish tanks? Our aquarium scraper is a sponge that helps to lift even the most stubborn build up off the glass. Simply scrub the glass walls with the pad and clean water, to help the build-up disappear in no time Made for Glass -- The aquarium scrubber doesn't have excessively sharp or hard fibers. Specially designed to be the ideal glass tank cleaner, as it is specially made to help avoid scratching or damaging your aquarium walls. Please note that this aquarium brush should be used with water and only on glass surfaces. Other surfaces, like acrylic, may scratch Multiple Cleans -- Our pad is large and thick when compared to others (3.25” x 3.25” x 1”). This allows you to use each aquarium glass cleaner numerous times. Scrub off gunk as often as you need with our 4 pack