I have a wall LG1230 A/C in my apartment. Sometimes when I use it,
the air smells terrible, almost like urine. I asked the maintenance
guy and he said there's nothing we can do, except turn the temp
cooler. I suppose something is moldy inside. It can't be animal pee
since I'm on the second floor.

Sometimes it smells bad and other times it doesn't. It also smells
bad on fan-only mode. Do you think there's anything I can do?