Use adhesive remover. 3M makes a good kind. Or use Goo Gone. Make sure to read the directions, and that it can be used on painted car surfaces. I have used the 3M spray can stuff and it works well. You might have to go over the area and wax it again tho.
I got all the stuff off pretty good...I used painters tape(green stuff) so it wasn't bad....I had the trep looking good.....I take GREAT pride in my ride...I also take some pride or maybe some honour I don't know in helping my friend out since they didn't have any money for a limo...... All they did was dry TP I made sure of it it was ****ing hot so there was always one or two of my buddies out around the car shooting the **** and making sure the car was cool!