[DanEC]

I have a time scrubbing bugs off of the front of my wife's Toyota Highlander. I can't keep up with keeping the thing clean with all the miles she puts on it. I picked up a bottle of Surf City Garage bug remover the other day at Pep Boys and for once, something actually works as well as advertised. After soakiing for about a minute the remains mostly hose right off and what's left just wipes off with a normal swipe of my washing mitt. It and a soft brush will probably make clean up of your radiator fairly easy. Back flushing from the engine side would probably work best.