But the caulk was not the problem. Instead the rubber boot which normally fits around the coax and over the opening into the trailer roof had been blown off it's normal position and up the coax a few inches.
First I used a mixture of water and Woolite to clean the ceiling (first photo). This was recommended by a cleaning seminar I went to during the summer of '05. It worked pretty well. The next project was to permanently plug the hole in the roof mechanism. I used clear silicone caulk ...so I think it is seriously plugged.