Hi everyone: I need some advise on how to keep the rear plastic window crystal clear on my 360 Spider. It seems some gunk or wax has accumulated on mine so it looks rather foggy. Have not used any cleaners yet because I think that will make the plastic yellow in the long run. Tried just mild detergent soaking then wipe with soft cotton towel. Seems to work after a lot of buffing with the towel, but takes too much effort and hard to get at the edge near the canvas fabric. Is there an easier way? I'd rather drive it than clean it. Thanks in advance for any comment.