Even though my array is ground mounted, I typically have only cleaned them about twice or three times a year. There are no wires or limbs anywhere near going over the array. The occasional bird does perch on the edge of the top panels, so your suggestion of bird spikes and / or loosely strung nylon cord is worth investigating.
My house has a metal roof with a 6 in 12 pitch. On the back of the house {that faces about 15 degrees off of true south} the roof overhang is about 14' off the ground. I might be able to climb up and do those couple / three cleanings a year now, but in 10 years, I don't plan any roof expeditions. Plus, I feel like I'm improving the array performance with the twice annual tilt adjustment. I am configured to do 49 degrees or 19 degrees tilt, depending on the season. Ground mounts are also convenient for clearing snow off the panels. Don't know how helpful that is in Sunny FLA........
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