Method 1: Wipe the scratched part with hydrofluoric acid. Hydrofluoric acid is extremely corrosive and can strongly corrode metals, glass and silicon-containing objects. )

Method 2: Use wool felt polishing wheel and polishing powder to polish the scratched place. (Felt polishing wheel is referred to as felt wheel for short, which is divided into wool wheel and pure wool wheel. Different materials specially used for polishing or repairing scratches, such as glass, metal, plastic, stone and jewelry.