do you have enough lighting at night? might be worth checking security cameras online, or just run your digital camera at night until you catch the bastard.
one way is to confront the guy face to face. just tell him you've been finding crap on your mom/dads car and want to know if he knows anything about it. ive had to do this to a fat middle aged woman down the street cause she kept letting her dog pee on my dd's wheels. even left a couple bricks near the car. i just walked right up to her and asked her about it. solved.
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