mine seemed to take ages before they released any dirt back into the water..once they started however the water gets pretty brown! i've never really been into bonnet cleaning so i can't compare,too much washing hassle but running the c/pads over low pile lightly soiled carpet is about the quickest way i found for maintance work. great to have on the van with a rotary,not for every job but a plus to your business. 2weeks ago i did 1000 sq/m in 5 hrs with them..haven't been paid yet though???
jim