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Carefully take them off using a plastic pry tool then use 3m adhesive remover or something equal and lay them face down on a paper towel, fold the towel over the emblem and wet the paper towel with remover. Let them soak for 1/2 an hour (keep wetting if needed) and clean them off with a scraper or a razor blade. When all the adhesive is gone clean them with alcohol and let them dry. On the truck use a pinstripe remover wheel or careful scrape off the adhesive with a plastic tool and keep wetting the adhesive with remover until clean (be careful of scratching the paint). When everything is clean and dry apply 3m adhesion promoter (found at your local body shop) to the backside of the emblem and let dry 1 to 2 minutes. Use 3m 1/2 in adhesive tape (found at your local body shop) and stick it to the backside of the emblem. Press it on firmly. Take some masking tape and make a line on the door making sure it's level and straight then peel the backing off the adhesive and carefully stick it to the door following the tape line. Press it on firmly. Oh also wipe the door with alcohol and let dry before putting the emblem on. Once this is done it should hold for a long time.