1, the steel ball shall be scrubbed with water or alcohol.

2. Blow hot air on the sticker with a hair dryer for about 5 minutes, and the glue on the back of the sticker will slowly melt and be easily torn off.

3. Rub some oil with a cloth. You can eat oil or engine oil.

4. Soak the towel in hot water of about 80 degrees Celsius for a while, put it on the glass surface with the words on it without dripping, use the residual heat of the towel to soften the glue, immediately stir up a corner on the edge of the words with a blade, and then tear off the advertising paper smoothly by hand.