I think the only option that will restore the colour is to buff it or sand it, remove the top layer and then it will shine again. I am thinking of a power ball foam thingy with plastic polish. I have the same problem on one door pocket, seems tan is the worst. It is dried out, but not chalky. Plastic polishes have come a long way in the last decade, they work pretty good on restoring colour to most finishes unless it is chalky, only sanding will work at that point (and change/smooth out the texture). Back to black was a gimmick at best, it is for cars that are not in poor shape. The tire slick that used car dealers love would probably work better, it is almost pure oil/silicone type of product, don't get it on the seat or pedals! I have tired lots of different combos including all the pro products, not much restores colour on plastic but hard work. Even a good car wax might work...it works wonders on headlight lenses.