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:
Antrim Carpets Maintenance Resource Center
Godfrey Hirst Cleaning Guide for Wool Carpets
JMISH Care & Maintenance Information
Signature Carpet Maintenance Manual
All Wool Carpet Care...
Wools Of New Zealand Carpet Care