A few days ago, my neighbor in front hung a flat mirror on the window to illuminate my door. My mother listened to a fortune teller and bought one from him. ...

It can also be put indoors. The landlord on the first floor answered correctly. You don't have to wash it with yin and yang. Just wrap it in red cloth and put it away.

If the other party hangs a mirror to insinuate his door, the best way is to negotiate with the other party and ask for removal. I don't approve of hanging a mirror to play by myself. If this is not done well, it will easily lead to contradictions and accumulate resentment from neighbors. A distant relative is not as good as a close neighbor, so we should improve our relationship with our neighbors. If the other party is not good at communication, you can use this method to resolve it, and put up a sign of "Good luck shines high", which will not cause conflicts, but also resolve hostility, implying "Good luck shines high".