I have removed numerous decals from vehicles. I personally hate them all because they fade faster than the paint and then leave outlines in the underlying paint when removed after they start looking bad. The largest one I removed was on a Crew Cab Frontier that went from the front door to the middle of the rear fender on each side and the most recent was on the hood of a Trailhawk.
My secret is first let them warm in the sun, the hotter the better, then use a fingernail to get an edge started peeling. Once you can get a grip fold the decal back over itself and pull so the decal is detaching from the surface and rolling back over the part that is still stuck to the surface. I can't explain the reason, but the "rolling motion" of reversing the decal 180 degrees seems to sheer the adhesive much better than a shallower angle and leaves much less cleanup after the removal.
Most of the time just washing and waxing removes anything remaining, but 3M makes an adhesive remover that you can get at any auto parts store that will remove stubborn residue. If required, use as little adhesive remover as possible and be very careful to wipe it as quickly as possible to prevent any possibility of paint damage
Badlands 2Dr, A51, 2.7 Auto, High Package, Tow, Capable Bumper, Roof Rack
Order 12/11/21, Build Week 9/26, 10/3, 10/10, 10/17, 10/24, Sticker 10/17, Build Date 10/24, Built 10/25, Shipped 10/27, Arrived 11/16, Purchased 11/21.