This is what we use on cars and trucks all the time for adhesive and decal removal. Use it and a plastic scraper or let a rag soaked in it lay on decal for about 2 minutes and decal will usually lift right off.
Avoid long chemical to paint contact ( like 15-20minutes of soaked rag on paint) because of possible blistering, but this can happen with any solvent.
Have used on hundreds of cars with no issues, you can always test in an inconspicuous area first.
MillerTime- Future Sabre Handler!!