I've used the Lexol products and they are very good.
http://www.lexol.com/vinylex.html

Also the Wurth rubber cleaning and preserving products.

http://www.wurthusa.com/project/en/leftnavi/catalog/product.php?path=09.0120.jpg

Best Engine cleaner I have found S100:

http://www.s100.com/s100_tcc.htm

Todd

-------------- Original message --------------
From: Richard A Jones <jones@COLORADO.EDU>

> For what it's worth (probably quite a bit....)
>
> John Paterek, the authority on interior restoration
> of Porsches, recommends cleaning vinyl with a dilute
> amount of P21S Total Auto Wash, followed by
> Lexol Vinylex with SP60 sunblock, which he says
> dries to a satin finish. This from the Porsche
> Club (PCA) tech pages.
>
> Richard