you wont believe me, some people in malaysia used Coca-cola to clean their radiator, and some used brake fluid. take out the radiator and fill with coke, and shake it vigourously... but i prefer to just use radiator flush, simply just drain the water, no need to take out the radiator. put those radiator flush, and fill again the radiator with RO water... about 100 miles later, i flushed the coolant, and refill with RO water.. done..