Remove sticker
Use a Heat Gun, more heat than a blow dryer (go see Steinel on Primo website
www.primoinc.com, very good stuff made in Germany)
An after than you could remove the glue with Orang-A-Tang, industrial product from Dustbane ( works great and have an Orange smell )
Sould work good !!!
I use the Orang-A-Tang on my rims to remove brake's dusk, works great !!!