After waxing my MH last week, I took the drain covers off the windows and noticed that they were clogged so I ran a piece of ceiling hanging wire from one side to the other and then blew out with a air hose. You would not believe what came out. They are aluminum windows and I waxed them too and came out looking like new. I am glad I did because Friday night we got 2 inches of rain, Sat night 1 1/2 inches and 1/2 inch last night and there is no standing water in the track. No roof leaks either. 31 year old MH It pay's to keep up on everything.