This may fall under the category of 'dumb question' but here goes. Is there a simple way to clean the plastic windows in the SL soft top? I'm not sure if they have a mildew type deposit on them or it is just dirty. It can be removed to some extent with lots of elbow grease but I wonder if I'm missing some easier way to clean them. It is very hard for me to get a good angle on the very center of the back window so I'm up for buying a product if it might help. (I have been pretty careful to never close my soft top if it is damp so it may not be mildew anyway.) Ideas? Thanks.