More than likely they are held on with two way tape. Do it on a hot day or use a heat gun to warm it up and just start peeling. You will find alot of dirt under there just wash & wax it. If there is glue use some goop off. Try it in a inconspicuous area first then wax
If you have any glue/tape residue left, 3M makes an adhesive remover that works like a charm. Just pour some on a rag and wipe off the residue. In my experience its alot easier than goo gone or any other household cleaners. They sell it in and 8oz. can at most autoparts stores.
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