I would put cleaning residues into that category, so treating the soils with a free-rinsing cleaning agent, then rinsing with clean water takes me nearest to that ideal.
The problem with detergents is that they work by forming spherical micelles around anything which is not water. Since detergents cannot distinguish between carpet fibres and soil particles they are not as free-rinsing as the likes of microsplitters and active colloids.
There are of course cases where an in-tank additive is desirable to tackle issues such as dye stabilisation or pH balance but with the correct soil preconditioning, they are not required for general cleaning.
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