Larry, 303 is the stuff! They initially developed it for the coast guard and their rubber inflatables. I would be buying stock if they were public, but they are not. They also make stuff for marine fabrics and soft tops. And you can use it on clear plastic and vinyl too (works great in the instrument cluster plastic). My father tells me a sailing publication, Armchair Sailor I think, recently gave it top honors in an extensive test.
They have both free samples and 'pay for shipping' samples.
http://www.303products.com/main.php
Sorry if I gush, but believe me, you will be cleaning your plastics and rubber far less often. Less work and superior results are exciting to me! This stuff protects, returns the plastic to original luster. Tires end up matte and stay black like they came from the factory -- not turn brown like some products do. Dash may take a few days to return to its original semi gloss, but it will. Door handles and steering wheel may take a few days, but will be protected and not slippery -- slippery steering wheels are a huge peeve for my father and he is satisfied with the 303 results. And it does not attract dirt and dust like many products.