I meant to ask how you got the nicotine stains off? The same gloop as the bathroom? I’m about to attach some upvc window frames that haven’t been touched for a decade.
CIF on the uPVC. It is apparently not the done thing but I reckon they mean for general cleaning. The vinegar was only really necessary for breaking down the limescale, the CIF is plenty abrasive enough for nicotine on the window frames. Vinegar on the glass to finish though.
If anyone has some of the same kind of build up on tiles or glass, a slurry of CIF and vinegar works a treat with a green scrubby dish sponge.