[6pack] Soft top window cleaner

[forzion at maine.rr.com]

I have a new soft top on my Six and, now that it's about a month or 6 weeks "old," I note  that the windows have a cloudy sort of film on them. I haven't 'treated' the windows with anything but did try Windex to clean them -- without success. Has anyone heard of or used an effective product for cleaning convertible top window plastic, removing that cloudy sort of film?

Thanks for any help!

Dave Friedlander
74-Six w/A-Overdrive + TBI