Then I choke up on the hose quite a bit and feed it in behind the radiator. I find this to be quite effective for cleaning out the mud. It does take quite a while though before the water starts running clear. . Had to leave an ATV on the trail once when it boiled out all the coolant. Drove back around with the truck to get it. That was when I .We always enjoyed the show MythBusters, so we tried to create our own backyard experiment that would put each cleaner on an even playing field. This Trail Grappler is a few years old and was recently removed from a Jeep and replaced with a larger set of treads. We picked the more stained and dirtier of the two . See more