Have a buddy who is a fanatic with cleaning his show car,
he has a 100 pt ss427, come over and give me a hand on detailing the bullet for the vinyl he used lava soap.
Best I have ever seen it look also actualy seem softer did not dry it out at all.
Amazing that pumice also has moisturizers in it works great

Have you also tried the Mr Clean magic eraser with mild soap and water?

I must have stepped in some trailer grease in the dark and climbed into the boat to turn off the batteries. Two days later there was some nasty stains in the vinyl.

The only thing I had handy was Fast Orange hand cleaner. With a damp rag and some rubbing the grease and the stain came completely out.

The Lava soap you used, was it a bar or liquid?

Cleaned my whole cockpit with Magic Eraser in the spring (didn't bother with soap, just water), probably the best it's looked since I got the boat!

My buddy who is a fisherman told me about it.

have used the Magic Eraser the lava kicks its butt
I use the lava bar work into a lather and wipe and rinse off

I'm going to pick up both and see what works best, I'm thinking the liquid. http://www.wd40.com/Brands/lava_faqs.html

WD40 works good on grease stains too!