Cleaning sponge with stainless steel work surface for all freshwater aquariums. Algae and residues are removed without scratches. This Aquarium glass cleaner from Rakso is a quick help with dirty aquarium windows thanks to its ergonomic shape, it is well in the hand. This sponge with work side made of premium stainless steel steel wool does not affect silicone sealant edges and both the sponge and the stainless steel steel wool are harmless to plants and animals.