Surface
Washing method
Label and protective film
Clean up with warm water or mild detergent and alchol or organic solvent in case of adhesives
Easy cleaning case such as dust Clean up with soap, warm water or mild detergent
Rainbow figure
In case of being caused by excessive detergent or oil, it can be removed by warm water or neutral detergent
Discoloration by welding heat
Clean with 10% nitric acid solution or hydrofluoric acid, neutralize with ammonia solution or sodium bicarbonate and rinse with water
Fingerprint
Clean with soft cloth dipping into alcohol or organic solvent like ether and benzene and rinse with water
Fat, oil and grease
Clean with soft cloth or paper and clean with neutral detergent, ammonia solution, or special detergent
Burnt organic matter and carbide
Dip in hot water of neutral detergent or ammonia solution and then clean with detergent containing soft abrasive
Rust caused by external pollutant
Wipe with oxalic acid, sulfuric acid, nitric acid solution (10%) and clean with detergent containing abrasive
Bleach and various acid materials
Rinse immediately, dip into ammonia solution or sodium bicarbonate and then clean with warm water or neutral detergent