Stainless steel sinks can be cleaned with warm water, mild detergent, a soft sponge, a non-abrasive pad, and a dry microfiber cloth. Stainless steel needs at least 10.5% chromium to form a protective passive layer on the surface. 304 stainless steel is often called 18/8 stainless steel because its nominal composition is about 18% chromium and 8% nickel.