This 2 Pack Yellow Star Oil Residue Sponge is a specialized cleaning tool designed to remove oil residues, grease, and film buildup from the surface of swimming pools. These sponges are ideal for cleaning surfaces that come into contact with oils, lotions, and other residue-forming substances, such as poolside areas and the pool waterline. Oil residue removal - specifically designed to absorb and remove oil residues, grease, and film, which can accumulate on the pool's surface due to sunscreen, body oils, or other contaminants Yellow star design - the yellow color of the sponge makes it easy to see when it has picked up contaminants and is ready for cleaning, while the star shape provides an ergonomic and effective grip Versatile use - these sponges can be used not only in pools but also for hot tubs, spas, or patios where oil residues may build up from lotions or other substances