How do you get the adhesive off a self-adhesive stamp?

It refers to the fact that tape does not need to be used the bandage has its own adhesive (tape)

Sierra Leone was the first country to issue "self adhesive" stamps in 1964. The introduction of self adhesive stamps was prompted by the problems of water based adhesives in tropical climates.

1 old penny

If the adhesive is still sticky, an artist's kneaded rubber eraser should remove most of it. Dab/rub it gently at first to remove as much of the surface adhesive as you can, then with more pressure...

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.