First take the large tank out open the top of it and place hot water in the small round opening, than put the lid back on and set the tank firmly back in place, then take the small shampoo resivour and fill that with only genuine bissell shampoo ( if you dont it could ruin the machine !!!! ) then theres a small knob near the small tank adjust that to regular or heavy traffic if its really bad.
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First take the large tank out open the top of it and place hot water in the small round opening, than put the lid back on and set the tank firmly back in place, then take the small shampoo resivour and fill that with only genuine bissell shampoo ( if you dont it could ruin the machine !!!! ) then theres a small knob near the small tank adjust that to regular or heavy traffic if its really bad.