This is off subject a little but I came across this tip on how to Superclean The Windshield recently and I had to share it.
Even classic, custom and hot rod cars have this problem with the windshield becoming covered with a grimy film and being difficult to get it really clean again.
Cant blame the glass, it is an environmental problem that has been with us for over a hundred years now.
As the video shows a bit of rubbing is involved and this will depend on how good or bad the windshield is, plus a readily available product to treat the outside, and another for the inside of the glass.
Once done future cleaning will be much easier.
I just need to get some 0000 steel wool as I have the rest, then I’ll do my vehicles windshields