I notice that I scuffed up the vinyl inside the liftgate...I think a barbeque propane cylinder rubbed against it.
Anyway there's a couple of spots that are scuffed and whitish looking (doesn't wipe off) and I wondered if anyone had a recommendation for a product that would restore the black color??

 

I have the same problem. Cleaned the interior today and noticed the same whitish stain on the glove box compartment. Usually it's my girlfriend who sits shotgun but I have no idea what she could've done to mark it up like that. I scrubbed with water, car wipes, leather cleaner, mild soap...for like a half hour and still couldn't get it out.

Any solutions get you my thanks and the world's biggest no-prize!

 

I've successfully used NOVUS plastic/trim scratch remover on my other cars....