Steam cleaning your carpets is the method we always recommend, but not just a steam cleaning process in particular. For residential properties we recommend that the consumer only hires companies who use a RX20's or any similar tool.
Why?
A RX20 weighs in at about 75lbs which causes amazing agitation, to top it off a RX20's head will spin (looks like a floor buffer) around 600 times per minute, a traditional wand couldn't even do 600 strikes in one room if it wanted to, a RX20 will do easily 6000 full rotations in an average sized bedroom.
Enough said.