Thanks for sharing. Perhaps your "elbow grease" was as important as the gasoline!
Meguiar's Ultimate Black (~$10). Worked well on my 10 year old Jeep Wrangler hard top and is preventing/reducing oxidation on the gray plastic trim around the bed and rear bumper of my Nissan Frontier. The contents are tan and work on colors other than black. http://www.meguiars.com/en/automotiv...ltimate-black/
Krylon Fusion paint: Adheres well to plastic Fusion for Plastic® - | Krylon