Just removed huge decals from a race car. I found that the usual products caused the glue to ball up even though it eventually removed them. I had some hand wipes that come pre-
moistened with orange oil and I added some of the liquid remover to them and the coarseness of the cloth was the key. Rubbing the glue with goo remover and all those types and a
cotton cloth was too time consuming. They have shop hand towels now that are blue and they are excellent also. The warmer the day the better they come off.
