I now have WFP, but prior to that, as others have said, a damp scrim and a dry one............just think of the Karate Kid and you'll be fine
Another way, the one I mostly used was to use a sprayer, and I found one of the most effective, and by far the cheapest solution to use was carplan windscreen washer solution.
Though now when I use my sprayer (insides) I use a solution made up with the Unger liquid. The likes of GG3 and 4 will do just the same.
Lightly mist the glass and buff clean with a dry scrim.
Piece of cake
But you may well use up more scrim.
Ian