What Actually Destroys Carpet (It Is Not Foot Traffic)

Hot water extraction sprays heated cleaning solution into the carpet under pressure and immediately vacuums it back out, carrying the suspended soil with it. The vacuum is the important half — heat and chemistry loosen the soil, but recovery is what determines whether it leaves the building or settles back into the fiber as the carpet dries. It is the method the Carpet and Rug Institute and most major carpet manufacturers publish, and for most carpet it is what the warranty requires.

They are the same thing in ordinary conversation, though "steam cleaning" is technically inaccurate — actual steam would damage most carpet fibers. What is used is hot water, not vapor. If somebody offers you steam cleaning they almost certainly mean hot water extraction.

Heat and vacuum. A truck-mounted unit produces water temperature and airflow that no portable can approach, and both matter. Higher heat means the chemistry works faster and more completely. Stronger vacuum means more water and more soil leave with the machine instead of staying in the carpet. That is also why truck-mounted jobs dry faster despite using more water.

Encapsulation has a real place — it is genuinely useful for interim maintenance in commercial settings between restorative cleanings, and it dries fast enough to clean an office overnight. What it does not do is remove deep soil. It crystallizes soil at the surface for later vacuuming. As a maintenance tool it is legitimate. As a substitute for extraction it is not.

It is a surface method — an absorbent pad spun over the carpet face. It cleans the top of the pile and leaves everything below it. It also has a real risk of distorting or fuzzing cut pile if it is done aggressively. It has a place in hotel corridors between real cleanings. It is not a substitute for extraction in a home.