Every Mill has their own specific suggestions regarding care and maintenance and it is important to follow their recommendations so as to not negatively effect any warranties...

Here are some links to help:

Godfrey Hirst Care & Maintenance Guide

Signature Carpet Maintenance Manual

Provenza Maintenance - Residential

Provenza Maintenance - Commercial

Provenza Maintenance - Oil Finish Products

All Wool Carpet Care... 

Wools Of New Zealand Carpet Care