Try this site
Flynn's Detail Products - Automotive Waxes, Polishes and Detergents.
I use his Ebony Polish and Chery wet wax my PT has 208,000 miles on it now and pillars look painted (my pt is black btw). Now if your pilars are really bad get his Top Line - its non abrasive and works superbly with a variable speed buffer set to 1100 - 1300. they WILL come back then its just a matter of keeping them waxed. You can do it by hand but it IS a lot of rubbing - depending on how bad they are!
You can do it!