i have to say that i haven't mastered the technique of cleaning traditionally as my output is down to lots of sweat and hard work as much as technique. But i am from twice as quick to 5 or 6 times as quick on some work.
I try not to show it but i do feel resentment at being questioned over the speed i finish a job now. I normally reply that i spend long enough on the job to do a good job and not a moment longer. If unhappy with the result please call and i will be back within 24 hours.
Or if i can manage a smile without it looking like a scowl, i say nothing and smile sweetly.