So way back in 2005 I bought some of those air bag warning sticker cover-ups that you see on eBay all the time--the vinyl stickers that go on the back of the vanity mirrors.
I put them on and they looked great, but then one hot sunny day I left the car with the top down (it was like 100 degrees out) for a while and the sticker bubbled up and looked a bit crappy.
Fast-forward to this past weekend when I finally got a new pair of stickers and decided to change them. I pulled out the heat gun and gently heated up the stickers and began peeling them off.
The air bag warning stickers stuck to the black vinyl stickers that I was removing.
Quite a hoot. Being the lazy man I am, I didn't attempt to clean off the residue that was left behind, instead I just stuck the new stickers on.
But if anyone wanted to know of yet another way to remove the warning labels, well, there ya go: add stickers, wait three years, remove!