After getting my 94 SD home, I washed it and put 2 coats of Nu Finish on it. It looked pretty good, but it was still kind of yellowish and lacking that showroom shine!
Yesterday, I purchased some Turtle Wax Rubbing Compound and rubbed the whole thing down. A horrible job to do (luckily I had a new set of rivet caps waiting to be installed, since the red rubbing compound stained all the old ones), but well worth the effort. I followed the rubbing compound with 2 new coats of Nu Finish (I should buy stock in this stuff!) and she shines like new. The paint
really whitened up. I will post pictures as soon as it quits raining!
For my dark blue van, I use Meguires Cleaner wax (seems to work better on the dark paint), and for all others I use Nu Finish.