As a kid I had a 1946 Jeep Wagon, you might remember, the ones with the brownish paint and the lighter beige....sorta "faux woodie" panels.
The 15 year old enamel was pretty dead and one of the body shop guys, who did some work for a local used car lot, suggested I add 1 cup of kerosene to a bucket of wash water. You had to towel dry the paint to avoid water spots but that ole Jeep looked like it had a fresh paint job for at least a week. Driving on a dirt road would require a quick "dust-off"...too bad they didn't have the "California Dusters we have today.
It works especially good on a dead red paint job! Doesn't cost much, is easier than a wax job which will be rough to buff out, and the diluted mixture wasn't that rough on the rubber seals.
BTW....you get better results if you have the water (no soap) in the bucket warm. Give it a try.....you'll be pleasantly surprised.
Dave