I've tried white spirit (which did the job at getting rid of the stickers left on the new woindows) and regular glass cleaner to no avail.
dh edged every pane with masking tape to paint them and then left them for over a month. I went to peel them off the other day and they've either left a residue or they just won't come off (where dh overlapped with the gloss paint).
Any suggestions?