from what ive discovered so far.
a bonnet clean will give a better result (visually) on a low profile office carpet but!
i cleaned an office carpet on thursday night, i used HWE with an rx, when emptying the tank, the water was absolutly filthy, (not been cleaned for 2 years).
now there was still shading where the door was and some of the chairs where they spin round, yet i feel the way i cleaned was far more beneficial to the client in this case due to the length of time between cleans, i will be going back in 6 months to do a bonnet clean and expect to get better results, this was the advice i gave the client and she was ok with this, there is no way i could of got all that soiil out with just a bonnet clean and i'm presuming if i had of bonnetted then traffic lanes would have appeared more quickly.
so from now on, if i come across a LPC that has not been cleaned for a while, i will quote for a full HWE followed by traffic lane bonnetting, but educate the client as to why they need both cleaning processes, something i didn't do this time, i'm going back monday night to bonnet, for free, (my fault)
then hopefully they'll still use me every 6 months.
derek (still learning) west