This is one of the more readable and succinct discussions of the trade offs between different carpet cleaning options.
The discussion of hot water extraction is pretty straight forward – sort of the stuff that almost everybody knows.
While generally considered the most effective means of carpet cleaning I will point out that we ROUTINELY clean up after truck mounted hot water jobs that left a lot of residue in the carpet. Generally the truck mounts do not use the fourth component of carpet cleaning – agitation under load – effectively and a properly used self contained unit with cold water or hot water, a lot of agitation and the right dilution of chemicals can do a superior job.
The real interesting part of this article is about “dry” encapsulation products tho. They are highly effective if :
– Used IMMEDIATELY after soiling – before stains set.
– Properly vacuumed out to remove all the encapsulation chemical and it’s attached dirt.
It won’t work in general as a “restorative procedure” and many users don’t understand the necessity for effective vacuuming after usage.