"Fiercest" Toad Uphostery Cleaner Or Cleaning Method?

I rent a carpet cleaning machine once a year, go over the whole rig twice. The kind that connects to a garden hose, and lets you add the cleaning product of your choice.

I hear good things about the Awesome brand of cleaners, from the dollar store. I have personally have good experience with Soilove stain remover, also at the dollar store -- or $4 on ebay. I don't know what is available where you are.