Here is a FACT!!
Nobody can remove 100% of ALL soils present.
ALL cleaning systems remove MOST of the soils present.
A second system used after the first system will ALWAYS get some more soils. Not much, but SOME.
A THIRD system used after the first 2 systems will ALWAYS get some more soils.
Not as much as the second system, but SOME more.
So... if you want to give the very best, most thorough cleaning ever, then use more than one system.
Which system is best for any particular soil load will depend on the type of carpet, the soil load, the wear and condition of the carpet.
Having more than one system will allow you to do different cleaning effort on different jobs, because no single system is perfect for all jobs.
The Master Speaks.
Gary