Use a hair dryer and work one corner then gradually pull back, working the hair dryer under the edge. I use a plastic spatula or a Scotty Peeler (https://www.amazon.com/Scotty-Peelers-Label-Sticker-Remover/dp/B0068QIQVA/ref=sxts_sxwds-bia-wc-nc-drs1_0) to work the sticker. Use Goo Gone sticker adhesive remover (or acetone) for the residual glue). Wipe clean with Naptha.