Use a heat gun or hair dryer to warm up the glue, which will help loosen it. Then, use some fishing line to get behind it and carefully work your way from one side to the other.
Use fishing line or dental floss to peel them off.
Try using an eraser wheel from Amazon along with a heat gun.
When I removed mine, I used spray adhesive remover and a soft plastic pry tool.
Considering the truck’s condition, I’d recommend using a chisel or a heat gun.