Polished stainless steel is a very sensitive material. It is not as conventional glass. Wipe the surface clean with a soft cloth.
Only use a bit of soap or glass cleaner on a damp cloth if absolutely necessary!
DO NOT use paper towels or wool. Using this kind of abrasive materials or applying the polished surface to excessive pressure while cleaning might lead to scratches in the surface.
DO NOT use cleaning agents containing alcohol or acid for not harming the back paint. The product is not intended for outdoor use.