There is a product called Color Back-
http://www.autozone.com/wash-cleaner...wax/553990_0_0
This truck had chalky paint and had sat in the desert -
http://67-72chevytrucks.com/vboard/s...39&postcount=7
and it came out very well. I would do color back and a polishing compound on a low rpm buffer, then a quality wax.