| Surface status | Washing method |
| Label, protective film | Wash with warm water and soft detergent, and use alcohol or organic solvent for adhesive. |
| stain such as dust that can be easily erased | Wash with soap, soft detergent, or warm water. |
| rainbow pattern | If it occurs by excessive detergent usage or oil, wash it with warm water and neutral detergent. |
| welding heat discoloration | After washing with 10% nitric acid solution or hydrofluoric acid, neutralize with ammonia or bicarbonate sodium solution, and wash with water or specialized cleaning chemicals. |
| fingerprint | Wipe with soft cloth using alcohol or organic solvent(ether, benzene), and wash with water. |
| oil(grease) grease contamination | After wiping with soft cloth or paper, wash with neutral detergent, ammonia solution or specialized cleaning chemicals. |
| carbon attachment, burnt organic material | After soaking the product in hot neutral detergent or ammonia solution, wash with detergent containing weak abrasive. |
| rust | Wash with abrasive detergent(or oxalic acid, sulfuric acid, nitric acid solution(10%)) or specialized cleaning chemicals |
| bleach, various acid attachments | Immediately wash with water, soak into ammonia or bicarbonate sodium solution, and wash with neutral detergent or warm water. |
