Dealing with old adhesives left by stickers, decals, PPF, etc is a pain. And products like Goo Gone are highly ineffective. But here are two products that work great and one of them is probably already in your house!

Flat Six Motorsports - http://flatsixmotorsports.com
WD40 - https://amzn.to/3vxU4Ev
3M General Purpose Adhesive Cleaner - https://amzn.to/3MJTb1f
Detailer Squeegee - https://amzn.to/3w21Jtw
Continuous spray bottles - https://amzn.to/3LyQake

[glue, sticky, cosmoline, cleaning, removing paint protection film, removing vinyl wrap, 3M adhesive cleaner, WD40]