Sun visor stickers removed, can't get the adhesive off ... HELP !

[mjclemm]

Hey guys, after trial and HUGE error, I removed the stupid looking air bag decals off my sun visors... Well, after my first failed attempt (absolutely ruined the passenger sun visor, so I bought another set) I tried to remove the decals with a hair dryer, huge mistake... All went to hell, ripped the venal when I pulled on it... Well, after learning from that, I used a heat gun for the next decal.... Worked FLAWLESS and took seconds to remove... Now, I can't get the adhesive off. I have tried white Vinigar, Goo Gone, Mean Green, Dawn dish liquid etc... NOTHING seems to be working. Is there anything someone else has used to remove this adhesive ? (See pic) it's not sticky at all now, but you can see where the adhesive was.... Any assistance would be great... Thanks...mjclemm...