The 4’ microwave dish that is used for communications to shore 56 miles away is supported by two large pipes that are experiencing a significant amount of oxidation otherwise known as rust! I’ve taken off both of them and brought them down into the workshop to beat them into submission before treating them with OSPHO phosphoric acid blend, then repainting and reinstalling for another 50 years! Just because I thought you’d want to know… Richard Ospho is available at many home-improvement and auto