Neighbors Dumping Stuff Off Their Balcony

My upstairs neighbors are constantly dumping stuff off their balcony. Water, soapy liquids, dog hair, debris, some sort of animal pop, etc. The most recent time it has also smelled absolutely terrible (wet dog and poop smell combined). I've left notes on their door and contacted my leasing management (this is explicitly prohibited in their lease). Is there anything law enforcement/legal wise I can do to make this stop? At this point, I'm going to have to get my balcony chair cushions deep cleaned because they are unusable.

Update: Also did another look and there are multiple maggots that were dumped? I don't think I've seen a maggot in or around my apartment ever until this.

Location: Northern Virginia

Author: Special_Werewolf8834