Rear radiator cleaning for dp

I cleaned mine last week, doing almost exactly what Wolfe said above. I used regular Simple Green and AC condenser cleaner. I rinsed until the debris stopped, and then rinsed until there was no trace of foaming when the water hit the coils. (Probably a good ten to fifteen minutes of flushing.) I used a water hose with a nozzle, but no pressure washer.

A decent pressure washer could destroy a radiator's fragile fins in a second.

Matt B