Followed some others' advice and screened in the left and right areas of the cowling in front of the windshield where the debris seems to find its way in easily. Had some scrap vinyl coated fiberglass screen laying around, cut a couple big rectangles and then started playing with them and trimming here and there to get them to sit in nicely, tucked under some of the plastic and way up in there to the left and right of the hood support. They work because I've been pulling debris out that has settled on them. Been in a few weeks now and no movement whatsoever. Also can't really see it when the hood is down. This sure beats pulling the wipers and cowling and cleaning out those end wells - especially the passenger side that is notorious for filling up if your car is left outside and subjected to leaves and such.