I have some stained Vinyl that is...or was white till it got a bit yellowed from sitting in storage.
Has anyone used this with good results?

I got those Mr Clean Erasers--they are magic--and they really work.

Make sure you put a conditioner on afterwards.

Magic Erasers are what have worked best for me in the past. I have also used Westleys Beach White Tire Cleaner with decent success. It is a little more harsh but if you keep it away from the threads you will be ok. No matter what you use you need to put a couple coats of conditioner on afterwards then put some 303 protectent on when you get it all cleaned up.

I've tried everything. I used the Mr Clean Erasers yesterday and was very impressed with them.

If Mr Clean and/or Wesleys BlaechWhite doesn't get it--nothing wil.

Yeah...I went all the way down to using BleachWhite with SoftScrub and two hand brushes to death....still has some yellowing to it.

Roll Off works great!

Roll-Off is one of the best vinyl cleaners there is, although not always easy to find. Are'nt those Eraser's great!? Ed

Update on the yellowing...
A fellow boater who has used the RollOff with great success told me to lay them out in the sunlight for the day....I know it sounds ridiculous but it worked, very white again!
I used RollOff with OxyClean and a scrub brush on those.

Bought a four pack of the MAGIC ERASERS this weekend after hearing how good they worked after using them I will not ever use anything too deep clean the vinyl. I did notice that it take everything off. You do half to put a condintioner back on, did it a couple of times and now it seems to wipe clean easier.