We mainly use Dynamall from Restormate. Commercial carpets it works a treat and never, ever had one complain. You will be amazed on what it lifts, it just eats away dirt from carpet tiles.
Domestic, once again, we never have any issues with it. If a carpet is really bad, we will extract first and then just bonnet over with Dynamall. Brings the colours out on the carpet, and smells great too!
Most domestic carpets we clean, are not that bad, this is where dynamall comes into its own. Pre-spray, let it dwell for 10 mins then go over with the oreck or whatever else you use.
If you speak to John Kelly direct, he will be able to help more. I know some don't like it, and think it's muck spreading (i'm not getting into an argument about it), John will be able to enlighten otherwise.
Regards
Darran