Roller stamp for wall advertising

Clean small areas with banana water or hydrochloric acid, and paint large areas with paint or water of the same color using Qiaoni Paint.
For seal advertisements such as phone numbers sprayed on the wall, shovels and wire brushes are not effective. You can use banana water or hydrochloric acid to clean small areas. Use the same color paint or cement for large areas. Apply paint again. Be sure to wear rubber gloves when cleaning with hydrochloric acid and other chemicals to avoid hurting your hands.