I live on the first level of an apartment building. There are two levels above me and the building is laid out such that when my car is parked in my space (in front of my garage) it is below the balconies of the other levels. Someone in one of those units smokes on their balcony and their ashes and cigarette butts end up on or around my car. Obviously this is incredibly infuriating.
I have never seen anyone on either balcony, smoking or not. So there are two possible apartments that could be the culprit, as I cannot narrow it down further.
What actions can I take to make the person aware that their discarded cigarettes end up on my car?
To me the options are:
Go to their door and ask if they smoke and just make them aware. I hate that kind of stuff and really want to avoid that. (remember I don't know which apartment is the culprit)
Put a nicely worded note on each door just making them aware of the situation. Seems good, but maybe passive-aggressive/cowardly.
Are there better options I can try?