I use Wolfgang Vinyl & Rubber Protectant.
http://www.autogeek.net/wg2700.html
Here's a list of products at Autogeek for interior.
Autogeek's Rubber & Vinyl Care products protect your vehicle's dashboard, trim, seats & tires... from the sun and elements. tire dressing, vinyl
It's non-greasy, leaves the dash and vinyl looking fresh, leaves a layer of UV protectant, and smells lightly of coconuts.