Urination in communal stairwell
I live in the 2F flat. Over the past few months, there has repeatedly been a strong smell of urine in the communal stairwell on the ground floor. It's a bit baffling. No animals in the building, as far as I'm aware. No new residents. All fairly nice. Even the one nuisance neighbour, I can't imagine her doing this.
The smell is unpleasant, obviously, and I'm also trying to sell! I've done the whole put up a sign and have emailed the management company, but I don't have much hope of them doing anything constructive. Can anything be done to prevent this from continuing? I've asked about dummy CCTV (real CCTV would be too much of a headache, I think). What are the options?
Edit: I have had no response from the management company (not surprised), but I did come home to a clean-smelling stairwell! I have no idea if it was the perpetrator or the cleaner, and who knows if it will happen again. Let's hope not