Any tips for cleaning dirt and oil out radiator fins? The radiator in my crawler is about 30-50% plugged. There's a transmission filter mounted right by it that must have blown a hose at one time, because there's a mat of filth in a wide radius around where that filter is. Can anyone recommend any particular solvents to use for this so i could just wash it out a bit with a garden hose at low pressure? I've read the best way to clean it is to remove the radiator and keep soaking it in a kiddie pool with dish soap and changing the water, but I would rather not go through all that trouble since it seems to be cooling reasonably well as-is.