I agree to an extent. Technique is a big part but product has a little to do with it too. I don't do the two towel method myself. I use one towel, spray window with a light coating over about 3/4 of it, wipe product with one side of towel, flip and wipe with the other. I have used many different glass cleaners an found a few that work extremely well. Personal favorite is Stoners, which is what I continuously buy because of the great results I always get with it. Do yes, technique is big, but product does have a lot to do with it too.