So I got out and did my1st cleaning of the radiator/CAC. I soaked it as much as I could with about a gallon of simple green, waited only 5-10 mins and started the rinse. I remembered that I just last year bought a wand to use in my hot water heater to help de scale inside. This wand has a 90degree bend at the end and the overall length is about 15-18". This worked perfect, with that angle I could shoot at just about any part of the radiator, I couldn't see it all but I'm pretty sure I got to most of it. This wand is thin enough that it fit between the fan blades and I the shroud, I just watched all the black gunk peel off with the water pressure, I plan to do another cleaning but we are heading out Thursday morning for a weekend trip so I think this treatment is good for now. Just wanted to share my wand idea, hopefully it helps someone get theirs a little cleaner. Thanks to all for the info!