Stainless Steel Spoon is Perfect for Ramen, Noodles and Soup. Instruction and Operating 1 Clean the products before using for the first time. 2 Use liquid dishwashing and sponge for cleaning the product and wipe it dry a once after use 3 Should not use steel scourer for cleaning Warning : Do not use with microwave Tip Stainless Steel has better weathering resistance than normal steels. When chromium in stainless steel have reaction with oxygen in the air, it will produce a thin film coat covering the surface of the stainless steel to protect rust. The rainbow color may be occurs on the surface of the products. This may be because of th light reflection of chromium oxide. However, this is not harmful to the health at all and we can get rid of ths color by rubbing with the lemon. The rusty slough may occur due to the quality of water used or if the stainless steel ware has not been properly this problem can be solved by using steel cleaner to wash and leave dried approximately 24 hours