Generally, the glue on ceramic tiles, such as the glue that has been torn off and kept dry, can be wiped off with oil, or wiped off with dry flour and rag to remove the adhesive. Generally, blowing hot air with a hair dryer 15 seconds can tear it off, and then tear it off. Generally, if it is glass glue, the effect of removing glass glue with alcohol bubbles or xylene is very good. Generally, the cleaned ones can only be scraped with a knife, and then gently ground off with fine sandpaper.