Adhesive removers work very well!
Once product I've used for over 30 years is
DuPont Prep-Sol 3919S. This is a chemical specifically developed for the painting industry for thoroughly cleaning and removing grease, oils, silicones, waxes, sealants and just about anything else prior to automotive refinishing.
While
DuPont Prep-Sol 3919S works and works well, I've found another product designed to perform in the same manor,
Klean Strip Prep-All. I've been using this for the past 2 years with 100% success and it's half the cost of the DuPont product above...
Klean Strip Prep-All - Available in gallons, quarts, and spray cans....