Step 3: Clean Carpet with Powerwasher
So she washed it with her gas-powered high pressure washer from costco.
First she sprayed detergent all over it, Then pressure washed it with the sprayer. Now she's squeegee-ing the soapy water out of the rug. There's a slight incline in the parking lot so the water will drain out. Then the carpet drained and dried in the sun for a day or two. She propped it up to get more airflow around it.
In some places the pressure washer damaged the rug because she got the nozzle too close, but overall it was very successful.
It might be good to put a wire guard around the nozzle to keep from getting it too close to the rug.