I've always used the turtle stuff.

The brush that comes with doesnt allow for any real 'hard-core" scrubbing. (it WILL break easily) but I just use a heavy scrub brush from under the sink at home.

I SOAK everything.. let it sit for a few minutes....scrub the crap out of it...shopvac it up, and let the rest airdry.

makes it all look brand new again.

Only problem I found is you have to make sure you spread it out evenly on your upholstery, or you get spots that look likes water stains (which will fix with another even spray and clean)

Can't beat the stuff for the price.