Rub with cold water first, then wash with detergent.

Appropriate amount of ammonia water can be added to the detergent solution for cleaning, or 2% borax solution can be used for cleaning. Finally, rinse with clean water.

Wipe it with gasoline first, remove the spotted grease, then clean it with 5 diluted solutions of ammonia water 10% and water, and then rinse it carefully with clear water.

Wet the spots with hot glycerin at 35℃, and then gently wipe them with a brush. After a quarter of an hour, wipe it with a cotton ball or cloth dipped in warm water at 25-30℃.

It can be removed by a mixed solution of 20 parts of glycerol and 1 part of ammonia water with a concentration of 10%.

You can wet it with acetone first, then scrub it with a soft cloth, then rinse it with 2% ammonia solution, and finally rinse it with clear water several times until it is clean.