70% isopropyl is safe for panels and will help shrink that for removal. Another is directly spraying a freeze spray through the small nozzle onto the adhesive. Hot soapy water also works well with soaking it

WD-40 and a plastic scraper.

I'm in the same boat. I haven't spent much time on it but the little time I used a heat gun. Looks like it will work decent and get most of it off but you will need to be patient. I also tried WD40 in a small area. Didn't work too well. Again, this was testing only so I didn't have too good of results. Looking at other things such as goo gone or something in the near future.

Scrape as much as you can with your finger nail by rolling it (if that makes sense) and put a rubber valve stem on a drill and get what’s left

Nobody has mentioned a 3m eraser wheel?

Eraser wheel on a drill. It’ll make quick work of that and not damage your paint if you keep it moving.