[WELL I HAVE A GALLON OF SIMPLE GREEN AUTOMOTIVE DEGREASER,,,I CALLED SIMPLE GREEN,,THEY SAID IT WILL NOT ATTACK AN ALUMINUM RADIATOR IF ITS MIXED SCRUBBED AND RINSED OFF,, ONLY IF ITS SUBMERGED FOR 24 HOURS OR MORE,, SO I BOUGHT SOME STANDARD AUTO DEGREASER,,AND ILL USE THE SIMPLE GREEN,,THEN RINSE RINSE RINSE ,,,,,,,ALL I NEED IS A BRUSH NOW AND A FEW DAYS TO GET R DONE/COLOR]