Hi Gary. Denatured alcohol sounds like the answer I’m looking for. Most of my pneumatic system may be clean since I’ve never found more than a trace of liquid in the wet tank, but I’m concerned about the gobs of oil that nearly stop the air flow when I open the bleed valve in the engine bay. Do you get the same? Is that oil a valid measure of compressor ring wear or is air output, i.e. recovery time, the only criteria for replacement? My recovery time seems fine. How many miles should a compressor last? Mine has 350K.