R-Clean, been using the bonnet method for a number of years, it has its pro's & con's... great for maintainance cleaning, rubbish on loop pile carpets, fantastic when used for agitation (i 9 times out of 10 use this method prior to hwe) & have had great results using it with micro-splitters, ie; craftex, one step & its replacement, catalyst on wool carpets (hot water)... in fact i've just brought another floor machine, a powr-flite C171... regards charlie.