We just used boiling water without soap as suggested by Mary Hunt the columnist.
Don’t soak the carpet, and vacuum until there isn’t any water coming up thru the clear plastic shield. It got close to walls and has strong suction. The carpet was barely damp after and the waste water was dirty so we know it cleaned. The machine is a lot of plastic but is easy to assemble and clean just be careful and don’t force or over tighten items. The instructions are very good and detailed. For the price we are delighted.
Alen A350 HEPA Air

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