i would aways put the top up when the car's not driven. In my case since I have a E90, keep my windows closed and moonroof closed. You never know if some hater is going to come by and dump some trash or coke in on your seats. Also, i for one hate dust, and even in garages there are alot of dust that can settle in your car.
My garage once did some maintenance and whatever they did, put a layer of concrete dust all over everyone's car. It was crazy, like a full smooth coat of gray dust.
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