this is what I thought and been told
truck mounters are missing all the steps, this means that you guys are very slow
Once I did a test, moderate dirt, two rooms the same carpet and traffic. Friends house so I had a time for testing.
One room I did just with quick hoover, spraying the carpet with prespray and after 5 min extracted, water was dirty, to check the quality I did second attempt doing everything as it should be. Water was still dirty.
Second one I did as I do always, all steps. Dirty water as normal. Second attempt on this carpet gave me clean water with only a bit of fluff in the inline filter.
Job done with Storm, water heated at at least 60 degres, hose 15m only.
It shows that carpet can not be cleaned proper missing these steps, in short time.