You did not state, but as others have stated, if outside just cautiously heat a little and it should peel off. You always want to use some form of a liquid, if scraping on glass, especially with a razor blade or sharp object.

 

If it is on the outside of the glass, spray with glass cleaner and use a razor blade. It will come right off and you can scrap off the glue too.

As long as you use a razor on an angle on glass there is no worry of scratches.

I clean my glass top stove with a razor too. Wipe it all down and use the razor to take off any baked on stuff

 

Plastic razor blade is safer to use. Goo gone melts the reside left behind. If anyone on here has entered a car at Carlisle in any show and let the sticker sit on the window you know the pain of removing a crappy decal lol.

 

Yeah thankfully it's on the outside and not on the tinted inside. Will be trying these suggestions the moment I get a chance outside of work

 

Nothing wrong with using a razor. My wife had a fairly large decal on the back window and it came off pretty easy with a razor. Wiped the residue away with some type of cleaner, nothing special.