Didn't someone complain about exactly this on here and was asking for help on how to broach the subject with the upstairs neighbour? Problem solved, here's your method!
Ha! It was me!
Solved the problem by becoming good friends with the pee-er. Then moving out. Must mention it next I see him. Or her. Maybe it was her?
@Dooks-Fatberg started
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Didn't someone complain about exactly this on here and was asking for help on how to broach the subject with the upstairs neighbour? Problem solved, here's your method!