Sacrificial soils are materials added to a soiled surface to help that surface become less soiled. Commonly used in non-critical applications such as home carpet cleaning (in which colloidal silicates and acrylics are removed when the carpet is vacuumed) or in commercial cleaning of textile garments (fluorocarbon polymeric materials or hydrocarbon polymeric materials as claimed in U.S.P. 5,876,461).

But sacrificial soils are not commonly found in critical cleaning processes. This is because more soil is normally the last thing users want to see in a critical cleaning bath.

MORE IS NOT WORSE
The presence of a sacrificial soil makes it easier to remove soil already present on a surface from that surface. This happens because sacrificial soil enhances the removal/recovery of all soil on a surface.

Normally, one thinks that more cleanliness (more removal of more soil) requires more cleaning work (for example, time) as shown below.

The reason the addition of more soil improves affairs is that the added soil is not the same material as already present on the surface. So a different mechanism of soil removal must be implemented. That mechanism allows removal of both types of soil present, the one previously inhabiting the surface and the one added.