The caulking around the windows of my TT seems to be melting. Seems like every couple of weeks, I'm out there scraping this "melted wax" looking runs out from under the windows. Seems like if I am scraping it off, it must be thinning out, so it will cause problems at some point. Is this a normal thing, or do I need to do some stripping and re-caulking of my windows? My trailer sits uncovered.