I've been letting some original Goo Gone formula sit on this for a couple nights now and it doesn't seem to be touching it at all. Any suggestions for a better solvent/whatever to get this gunk off before I put the new decal on?

 

Oderless mineral spirits and vinyl sticker remover wheel

 

You want the best stuff that was actually made for the job and won't damage the paint...Here it is....

 

https://www.3m.com/3M/en_US/p/d/b40065358/

Works great for removing trim/emblem adhesive.

 

What Corky said.
Stuff is great. But not cheap.
Little goes a long way and it does not evaporate quickly.
Pretty sure it comes in a spray can but never used it and thinking you are better off with the quart anyway.

 

A quick, simple and cheap solution? Drop by a local body shop and ask for a little bit on a rag.
PS. Bring your own rag

 

The 3M stuff is mostly naptha and xylene.
https://multimedia.3m.com/mws/mediaw...9lxtD7SSSSSS--

 

Thanks for the advice everybody. Lots of good suggestions here. In addition to the 3M stuff, I've also been advised to try soaking with WD40, and to add heat via heat gun or towel with hot water with your solvent of choice.

 

I've always had good luck with the 3MAdhesive Eraser Wheels.. They require patience but I have not damaged any paint with one yet.