Stainless steel is germ-resistant, sleek, durable and non-porous, but it still can be stained. When you have stain or fingerprint on stainless steel, you can wipe the surface with microfiber cloth. Mixing baking soda with mild liquid dish soap and gently rubs on smudges is another useful way. Remember to rinse the surface thoroughly and then towel dry. If there is still stain on it, you can try vinegar. Try stainless steel cleaner for a tougher cleaning. The most important thing you should do after cleaning is rinse the surface thoroughly and dry it with clean, soft cloth. This can avoid the stain caused by water.