My uncle had a pin-striping business. He would use a straight razor blade(carefully) to first remove the stickers. You could also use a hair drier to get the glue soft then peel the sticker off. Last he would use GOO GONE orange based citric cleaner to remove the remaining glue. I've done this on many thing including my
Boler and it won't damage. Goof off is very strong and I would be scared to try it on my
Boler. Rather I will not even think of trying it on my
Boler.