I had very good success cleaning my top with the Porsche cabrio top cleaner and then re-proofing it with the Porsche cabrio top reconditioner. Car Care Specialties sells them and has a great article in the How-To section that I used in working on my top.
I'm not sure how necessary the cleaner was, but I used it anyway because I wanted to make sure things came out the best. After applying the cleaner and protectant the top is good as new. Blackness is all back in it and water is beading up beautifully.
I can't remember what I used to polish up the window, but have been reading a lot of good things about Plexus so if I plan to start using that in the future. If I can find somewhere that sells it locally i will be really happy, otherwise I'll get it online.
Rick
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Speed Yellow 2000 Boxster S
(with a great looking black top
)