How many kilometers does Camry clean up carbon deposits?

There is no regulation on how many kilometers to clean up carbon deposits, and the formation of carbon deposits will be slower when driving. My car has been more than 80 thousand kilometers for ten years and has never been cleaned so far. If the carbon deposit is less than 10 thousand, I try not to do it, which is very harmful to the front of the car.

One is to take some preventive and remedial measures to minimize carbon deposition, 1, and use clean fuel that meets the label; 2. Cultivate good driving habits and shift gears by hand over 2000 rpm; 3. Raise the speed at regular intervals, so that the engine can run at high speed to remove slight carbon deposit.