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Title: Appears to work most of the time
Review: Continued desecration of my black car drove me near the edge, so I was willing to try this. I screwed it to the wall near the car port, and it appears to work. 99% reduction in footprints, and 100% reduction in cat poop. I've still seen some occasional evidence, but apparently the neighborhood cats are not deaf, so it seems to work ok.
