How do you remove label adhesive?

Try going to Wal-Mart and getting some Goo Gone.

I use a product called "Goo-Gone". It's an oily orange substance that smells of petroleum. (I'm in the United States.) I've found that very non-polar solvents like oils (Goo-Gone, gasoline, mineral...

Spray a little WD-40 on a cloth or directly on the adhesive and it will come off easily. Fingernail polish, gasoline, laquer thinner or a razor blade will do the same but WD-40 smells better.

There is a solution that you can get at Home Depot or Lowes called GOOF OFF. This will remove your paint though. Hopefully the adhessive is on your windows or bumper.

I once saturated the area with generic acetone. Worked like a charm, but area must be well ventilated-also, very explosive; no smoking or open flames.