Well, DUmmy -- what works on glass stains is based on what is staining them in the first place....
Sometimes household bleach works best. If its a hard-water stain, you could try ammonia.
With that being said, you could save yourself a bunch of time and energy by putting both bleach and ammonia into your glass. Also, you should make sure that all of your doors and windows are sealed first to keep the 'magic' from escaping - so, maybe lock yourself in a closet.
Don't worry about the funny smell - that's just to let you know it's working !
