Today I was vacing the car with the Rainbow & I got 1/4" of gritty dirt on the bottom of the water pan, & I only used the upholstery nozzle. After that, I steam cleaned the car's carpet & boy did the Rainbow pull out DIRTY water nonstop (in wash mode) Then, I slide the AquaMate's control lever to "Rinse" & the rinse water was still dark.
btw, the carpet had a HUGE motor oil spill, & the Hoover Steam Vac only got very little oil & dirt, but left the rest behind. I used Rug Doctor Oxy Steam detergent for the wash & LA's Totally Awesome for the pre-treatment & the Electrolux Turbotool Rug Washer for the scrubbing, then the Bissell upholstery nozzle (attached to AquaMate) for extracting. Getting the remaining oil out of the carpet (if any still left) is hard but I may have to give another round soon.