I feel your pain Roger. My compressor is going out on me and started spitting out a lot of oil so I ordered a new pump for my compressor and will have to buy all new hoses as well as clean out my tank. I couldn't even blow off my car without getting oil on it. So until my pump gets here I just used one of those little dryer filters that go before the spray guy for added protection in front of my blower nozzle and that seemed to work. I haven't gotten to the point of priming anything yet but you can bet I will be picking up some scott's towels and some more wax and grease remover before I do. I had never had any problems with laundried rags before but after reading your problems I won't be taking a chance. Don't forget to flush out your gun real good before you put any primer in it.