Consider this a public service message... this is one of those many things that no one ever told me and I just found this out the hard way. Male dog urine will completely corrode away the aluminum cooling fins on an air conditioner unit. I mean completely, into a disgusting powder you can wash away with your hose and have nothing left. If you have male dogs around, make sure you have a fence around your air conditioning unit or you'll be replacing it. There, someone told you before you find out the $$$ way.