Check Your Door Knobs

I know it seem a odd request But a Neighbor made me aware of it unknowingly. His first action when a man was not in my apartment was a knock at the door saying " Cut down the noise when I had none. This let to a talk on the front steps saying I don't like you. So I sat down intentionally to see why. He after 1 hour decided I was likable. So he told me that in jail a old man said smear a person's doorknob with fece. See that upset my stomach. So I constantly smell the air it reeks. And the knob will have dirty smears on tested soapy bleach cloth. That's why I request your utmost attention.