2. Generally use 1 serving of dilute ammonia water solution mixed with ammonia water with concentration of 10%, and then dip this solution with cotton balls until it is clean. If there is still residue after washing, it should be wiped with 3% hydrogen peroxide solution first, and then rinsed with clear water.
3. Mix 4 parts of ammonia water with the concentration of 10%, 1 part of soda ash (sodium carbonate), 2 parts of refined white soap and 4 parts of alcohol with 100 part of water, wet the stain with the mixed solution, wipe it until the stain is removed, and then rinse it with clear water.