A good DIY fabric cleaner?

Everything on my new Miata is perfect except for the stain that's about the size of a half-dollar on the passenger side seat. I tried some shout, per the Mrs. and it didn't affect anything. This is black interior and the stain is it just a lighter hue of black. What's the GRM go to?

edit: The title should say good stain remover, not fabric cleaner. Sorry.

Also, it's unknown what the stain is. A PO did  it. 

Black dye?  The stain is probably gone, but it may have damaged the underlying material. Try various stain removers first, then if all else fails, black dye.

In reply to Dr. Hess :

Any recommendations on a stain remover? Something aggressive, but won't harm the black fabric.

Coleman camp stove fuel, otherwise known as white gas which is essentially the same as dry cleaning fluid.  You should be able to get it at any sporting goods store and probably most hardware stores.  An old time auto upholstery shop owner told me about it; it works quite well on both fabric and vinyl upholstery, and doesn't leave a ring or an odor after it dries.  Put some on a clean rag or towel and rub the stain, and keep moving to a clean spot on your towel or rag as it lifts up the stain.

Spot Shot.  Do it.

I know it says "carpet."  I use it on upholstery all the time.  It is more or less dry cleaning fluid in an aerosol can.  If this doesn't do the trick, it isn't a stain.  It is a discoloration of the fabric and you'll need to re-dye it.

Another idea is (don't laugh) a pressure washer.  I have done this a few times before.  My 99 F150 was pristine except the PO was an excavator.  The seats and carpet were a mess.  I pulled the seats out on a hot day and pressure washed them.  A couple hot days later they were dry and went back in.

In reply to Curtis73 :

Being what season it is, I might have to wait until summer to do that one.

Tuff stuff 

Resolve spray and a medium stiff brush.

I've had good luck with brake cleaner.  Got some gnarly stains that I think were mostly oil-based out of 15 year old conversion van carpet with that stuff.

In reply to _ :

I use Resolve.

New idea- coloring the spot with a sharpie. 
yes? No? Maybe? I've used it on button up shirts before. It usually lasts until a few washes. Not sure if it would rub off on passengers (which would be SWMBO). 

I think Coleman fuel is naphtha, which was an old spot remover.