Really???
Under real life conditions?
I cant remove 40% of soils on some carpets using a rotovac. I may have to go over it a few times to remove 50% of soil in carpet.
Let say if a Rug doctor is used in a homes carpet by the owner, I most times find so much soil deep in the carpet it takes me extra time and more passes using a wand or 360.
When I did ask if a home owner knew if it was a pad cleaning, other type of wet vac clearing or a rug doctor before, most tell me they do not know what was used before to clean the carpet in question.
Tell me how come a TM using so much heat and 300 CFM with a 200 inch water lift does not clean as good.
I see TMs that do not remove that much soil, depending on the type of carpet and dry vacuum used.
First, you should read the methodology of the testing. Soil is evenly distributed throughout a section of carpet before the test. The particular extractor is used (mechanically, no human factor involved), and the amount of soil removed through extraction is measured. I'm not quoting number of passes etc. because I would need to reread the thing myself. It is not real world conditions, because those vary each time, but all of the products tested are tested in exactly the same way with the same amount of soil in the carpet and the same type of carpet before each test. The test isn't trying to determine who can clean the nastiest carpet (though I suppose you could make such a test), it is simply seeing how much soil you can remove when cleaning. No equipment gets 100% of the soil out, but many/most truck mounts achieve the Platinum rating (90+%) and a few portables (Rug Doctor included) achieved it as well. Like I have said, I'm not plugging the Rug Doctor here, but the test is test and it's fair to all and some products are better than others (some surprisingly so).