How 'greasy' are they? Steam clean may be unnecessary. We clean aluminum parts for anodizing using a very hot high pressure water spray. What we use is a standard restaurant dishwasher that heats the water to 85 degrees C and sprays the parts, in a stainless mesh basket, from top and bottom with rotating nozzles. The parts come out so hot from the water that after a brief blast with air they are dry within a few minutes.