Engine idle speed running down after 5 minutes, put off the cooling fluid, add this product to add fresh water after the water tank; Start the engine to normal operating temperature, then the idle running 10-20 minutes, scale the heavier or water tank not clean for a long time, need to double to extend the time of cleaning; Net engine shut down, the water in the tank, and add water, run 5 minutes and then drain that is clean; Car (below 10 litres of water tank volume) in a jar, cart (more than 10 liters) water tank volume with two cans.