I live on the coast of San Francisco. My other antennas are OK but my discone for some reason devlops this rust colored coating on the elements even though it's supposedly 'stainless steel' so I get up there with the rubbing compound , rags and I even put a coat of auto sealant on it. Is there something more practical to use on this? Perhaps an aerosol cleaner or such? Thanks By the way I have to do this like every two months.