I used this the other day on my Moms car . Her radiator needed flushing BAD ! It was gross ! ...I put this in the car , turned the heater on and let it run for 10 . Im sure you guys know the deal .The drained it and flushed it with some water . WOW , it worked so great .The water came back out so clean ! ...This stuff works great guys and I highly recommend it if you have to flush a radiator anytime soon !