Plastic is polyolefin, which is easy to oxidize and will become sticky after a long time. Solve this problem in the following ways: wipe off the oil on your face, first cut it off with your nails, then wipe it off with a wet towel, blow it with a hair dryer, and the glue will be hot. Brush it with essence, and it will fall off after a while. Just try it. You can try the eraser, but at first you may think it is dirtier, but after a long time, you will.