1. Soak oxalic acid first, then bleach it, then clean it with water, or gently wipe it with carbon tetrachloride, then clean it with water and chewing gum.

2. Put the stain in the square. Soak for ten minutes, and then wash gently with clear water. Wax.

3. Colored clothes can be wiped off with gasoline, loose water or alcohol. White clothes should be wetted with gasoline first, then washed with 10% ammonia water, and then wiped with alcohol. Shoe polish

4. Wipe with alcohol or gasoline first, and then rinse with water. cosmetics

I don't know if it is effective for melting materials in balloons. You can refer to the reference.