I don't have them, have to use the ladder to clean off the slide top, but I would check it anyway, before closing up. I take a stiff broom, and do a quick sweep.
That lets me check all the roof-top visually as well.
I heard a good trick: buy a basketball-sized plastic beach ball, and shove it under the awning. It will bulge the material upward and relieve any pooling.
Push it out, when you do your ladder check, and slide in.