Lots of good info, thanks folks. Now I've got something to think about, and some stuff to order.
I think I may try a bottle of the UWW+ and some sort of spray wax or sealant.
Based on a fair amount of reading on this site, I purchased some Ultima Acrylic Waterless Wash concentrate and some MF towels (and a mitt for the wheels). I'm tired of my car being dirty for months on end. Living in an apt has that as a downside. I used it for the first time the other day...