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Never had this problem since I owned my coach, BUT I religiously go up on a ladder to check all my slides before retracting them. One of the worst places was Loveland, CO, when I was under cottonwood trees. What a mess! Fluff, sap, and little pod shells all over the top of my coach and slide tops. I had to get a bucket of hot soapy water and dish sponge to clean it all off before I could put in my slides. We try not to park under trees when possible. My ladder gets quite a work out for we are full timers and travel a lot and I always check before pulling in the slides.