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The condensor is immediately in front of the radiator- right up against it. You can use high pressure air directed from the back of the radiator (the fan side) or less effectively, a water hose. You could also try a vacuum from the front side.
the air dam/scoop, combined with the Vette's low ride height, makes the condensor and radiator pick up more debris than more "pedestrian" cars. i would venture to guess that many C5 owners could benefit from blasting all the crap out of their car's radiator and condensor fins. it seems to have helped mine.