I had tried Armor All, the Mothers "Back to Black", etc... and didn't like the results with any of them. They either didn't work or didn't last. Then I got some kind of foo-foo auto products sales magaziine in the mail one day (don't know why I got it) and it was filled with a lot of expensive products that people who drive Porsches and Corvettes and other high end vehicles would probably want to buy (like Buffaloe skin "driving shoes") and the only thing that caught my eye was the Forever Black. It cost like $20.00 for one kit, as I recall, I haven't bought any for years now... because the vinyl is still BLACK. $20.00 bucks might be a bit steep, but to me this product was worth it because corrected the problem and I don't have to dick with it anymore. It did what it was advertised to do.
Oh and I used blue painter's tape to mask off the truck's painted surface like around the side molding and around the door handles. I used Cue-tips to get the area under the lip of the grill. This stuff blackens out the door handles very well too.