Folex at home depot is about 7 bucks.

I use it to shampoo carpets, car seats, sofa's anything fabric.

Someone mentioned detail geek, and this is what he used when he first started out before he created his own line of products. I also bought the bissel cleaner he has and it's worked flawless for 4 years now but its just a wet/dry vac with the ability to spray water which is nice.

Dilute it, Drill brush it, and wet dry vac if you don't have an extractor.

The key is to saturate it more then you think you should. Not using enough water will not penetrate the cushion enough to remove the deeper part of the stain/spill. Then keep vacuuming it out.