Hey guys I very' much appreciate the input, I will try all.
I have so many chemicals now that I can probably start my own hazardous waste dump.
That Westleys has a pretty good kick to it.
I was answering my cell phone while using it.
The problem is the cell phone was not ringing.
I MAKE JOKE !

+1 on the Spray Nine and some good sunlight/air exposure

Roll off is good stuff also. We had to resort to the Magic Eraser in some spots on the top of the seats in ours, but I agree, try everything else first because it seems like it actually removes some of the vinyl with the stains.

roll off is an acid. too harsh for seats. acetone is also too much...

Be really careful using bleach on upholstery. It'll weaken the thread a LOT and even if it doesn't damage your vinyl, you'll soon find your seams are splitting. If you decide to dye the vinyl, use the SEM Marine vinyl coat. It's the only one with UV inhibitors and for a shiny finish, cover it with the clear coat. The color spray leaves a really matte finish.