I have used the clutch cleaning procedure on our manual gearbox cars in the past, sometime the manual clutch will judder on pulling away - what I do is apply handbrake firmly, select first gear and try to drive the car against handbrake while slipping the clutch for as few seconds - clutch take up is perfect after, do not heat the clutch up too much - my clutches normally last the life of my ownership which on my first Civic was 190,000 miles and still good when I traded it in for first Jazz, Have used the clutch cleaning process on our Jazzes and my present Civic very occasionally when clutch take-up becomes juddery. I think problem with friction clutches is the friction pads can get glazed and this affects the grip on flywheel face - making it variable - making the clutch do a bit of extra work sorts out the glazing and makes the friction level a lot more even.