Do the usual first (wash/clay) then look at the finish.
As always, start mild and work up. Newer Porsche paint is soft, so you may have one that has a bit harder finish. Test in areas not seen to see how tuff the finish is.
I've used Menzerna on my 997 C2S with great results. You can use mostly any good polish (Meg/3M etc) as well. I just like the way Menzerna works a finish, it took a little time to learn as opposed to 3M, but it does well with the right tools.
Leather and vinyl also must be treated. Clean the leather with a mix of Woolite and water, then dry well before treating with a mild conditioner. Stay away from Lexol, use a product more developed for automotive leather. Also, stay away from Hide Food, that is used for un-coated leathers. Always go mild just like polishing a finish. I've used Zaino Z9 and Z10 as well as Sonus and other mild leather conditioners. Nothing harsh.
Congrads on the 944, and please join PCA (Porsche Club of America)!
Regards,
Deanski
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DR SHINE
Member: PCWA
Member PCA-CVR
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'06 997 Carrera S PCCB, PSE Chrono,