I failed to update this thread - I used Woolite fabric cleaner and a stiff brush on an FJ60 back seat and pass. seat. I misted the seats (cover installed) in the yard with water, scrubbed with the brush dipped in a Woolite/water mix, and then shop-vac'd the seats. I did this a few times and rinsed the seat fabric with water and shop-vac'd some more. These seats had dirt and crusty (literally) sweat on them.
The seats look infinitely better, if not new. The shop vac did get out a lot of water and in 24 hrs. the seats were dry. I'll try to post a pix. Grease stains did not come out. The best part about Woolite is that it leaves behind a faint 'clean' odor, and the seats don't stink like Tide.
Colo Springs, CO