My go to’s are simple green or chlorox spray. And leave in the sun for a day. My white vinyl comes out Snow White. But you need to put VLR, or some type of conditioner on it to get that shiny feel back. My stuff is ancient so I care about color over that.

Star Brite and Tub O’ Towels did not work. Hopefully the Sun will get it out.
Thanks everyone for the suggestions.

The last resort is acetone, with a quick wash and new conditioner on it rather quickly. The acetone takes out practically anything, but it melts the material while doing so. I managed to restore a boat interior that would otherwise go to trash.

Do try on a hidden sample somewhere and do use it as a last resort :).

https://cimg3.ibsrv.net/gimg/www.off...a91bb73533.jpg
after
https://cimg4.ibsrv.net/gimg/www.off...777cc9604d.jpg
after
https://cimg0.ibsrv.net/gimg/www.off...04a4768c2c.jpg
before
https://cimg1.ibsrv.net/gimg/www.off...a6e93d4498.jpg
before
https://cimg2.ibsrv.net/gimg/www.off...0bc92b42f7.jpg
before

The Awesome cleaner from the dollar store does do some great work...
but that stuff can be a lot harsher than what I would like to use on vinyl.
I first used it heavily diluted to clean my siding, eaves, facias, and overhangs.
Did a good job of cleaning and whitening them up, but if rubbed too hard, the while finish came off aluminum.
Full strength would really peel some paint off.

I have seen a LOT of different stains come out of my white vinyl seats from just an afternoon in beating down hot sun.

Good luck

Nice work.

I'll dive into any mechanical repair project...but upholstery is my nemesis.

Jbooten,

Westley's BleachWhite seems to do a good job on WHITE vinyl.

Thanks. Brad.

I have dived into it now :D. Upholstry was easier than a completely worn out everything :D

Mild soap or just regular all purpose cleaner will do the trick. Gentle scrubbing. Remember to lube up the vinyl after since youre taking all the oil out of it.

Sold boat. Problem solved. Thanks all for the replies.