I'm sure most of you been there. I finally got my boat registration sticker from the dnr (finally). Didn't get the 3' number & letter decals though? I guess you have to buy those separate? (newbie here)..Anyway, I have to take the old ones off the jon boat and I was told by a friend to use a hairdryer and a plastic scraper. Any truth to this or other ideas? Thank you in advance.