When I removed the carpet from my door panels I set them on saw horses and poured lacquer thinner directly onto the carpet. Let it soak on for a few minutes and the glue softened up enough for the carpet to just peel right off. Then I used thinner to remove the rest of the remaining glue. I know, most folks would worry that lacquer thinner will eat up the plastic. Ive used it on multiple panels with no harm at all. I just took the top sticker and all the glue off of a Cutlass radiator shroud with it on Monday. Get a can, try it on the back. It works well.