Daily vacuuming is an important cleaning activity, to remove all dusts and dirts. But a deep extraction cleaning must be performed to remove really stubborn stains or embedded soil. Most carpet manufacturers would recommend that carpets must be dry- or wet-extraction cleaned, or, at least, use a cleaning method recommended by them to maintain warranty.
Carpets in general regardless its fiber should receive regular deep carpet cleaning to maintain its look and keep its peak condition. Now, there are two (2) basic methods used by carpet cleaners like us, Keen To Clean:

Carpet Steam Cleaning (Hot Water Extraction) Method

This method is widely recommended by carpet manufacturers and carpet fiber producers when carpet cleaning. It is also classified as “deep cleaning” because it is capable of removing soil deep in the carpeting or removing really heavy stains. Also, the advantage of this process is that it has ability to flush out large amounts of it.

For your guidance you can use our residential carpet cleaning chart to determine how frequent you should clean your carpets.