... towel if necessary.2,Shoe polish, sunscreen and pen oil can be wiped by sponge-dipping perchloroethylene, dry it with ... clean hard, wipe with a sponge dipped perchlorethylene.6,Chewing gum can be removed residue after injected into small pieces by Freon ... completely.Fifth: Prohibitions1,Smoking,discharge fireworks or welding2,Throw chewing gum, peels and snacks, juice and oil dirty in the venue3 ...