Bit of background info so it is not AIBU by stealth. We live on the 9th floor of an apartment block. The people above us have thrown cig ends, drinks etc onto our balcony.
We have been in contact with the management cmpany and they have sent 2 letters to our neighbours and to the neighbours landlords.
When I confronted neighbours about them throwing drinks (tea/coffee) onto the balcony they just kept saying "prove it is us".
Well, this week I am on holiday - yippee. Heard neighbour on balcony and SAW him throw the dregs of his drink from his balcony. So I can say 100 percent it was him.
So, AIBU to ask his landlord to provide an abseiling balcony cleaner to clean the glass (outside) on my balcony.