I really struggled to get the residual stick-um off the tank when I took the stickers off my 05. Some people say Goo Gone works, but didn't do nuthin for me. I also tried acetone, paint thinner, lighter fluid, WD-40, alcohol, etc. etc., and NONE of it really seemed to help much. Some softened the goo to make it a little easier to scrape, but still left a lot of residue. Took me a long time and a lot of hard scrubbing with a rag to eventually get it all off. I dreaded this chore on my 07, but I found a perfect solution!
Goof Off (any hardware store) will eat at the plastic sticker and soften the stick-um, making it pretty easy to scrape the sticker off with a thumbnail, but the leftover stick-um will still be hard to wipe completely off.
I found a spray can of stuff from MG Chemicals at Fry's Electronics called Label & Adhesive Remover that takes the glue off just as easy as wiping up jelly with a wet sponge! Didn't seem to do much on the sticker, so I made it a two step process - Goof Off first to scrape the sticker, then a quick spray on the leftover goo and a wipe with a rag and done. Sooooo much easier than the fight I had with my first RSV, and no waiting around for the stuff to eventually get soft - almost instant gratification. The whole job couldn't have taken more that a couple of minutes.
Goose