When I had a farbic roof, I had a spray bottle of a Woolite/water mix I used for fabric cleaning, as a soft brush. I don't really have a problem with bird poo since I got the M. Last summer, I was parked on the street outside my office and looking down I noticed several passers-by were slowing to stare at the right rear fender. Thinking something was up, I went outside to check on the car. There was a bit of bird crap on the fender - and a dead pigeon lying on the ground next to the spot. I don't know what happened, but the city's birds have left my car alone ever since. :?