To Lorimay, who has
grease stains on glass:
Have you tried the K&A standard of 1 part vinegar, 1 part warm water, and a few squirts of liquid soap? The vinegar and soap are both great
grease fighters.
I have just used this on a very old mucky sash
window I picked up at a flea market (read: picture frame) and it turned out very well.
Mix the ingredients in a spray bottle and use crumpled newspaper to wipe. This will take a little bit of elbow
grease, but it works like a charm.