Linking this here, not in the mood for double posts
But something else does its job, apparently. Although differently than I’ve anticipated.
The landlord called me two days ago, asking me about the neighbouring family and their stance towards keeping stuff clean and keeping junk out. Apparently the shop owners from downstairs filed a complaint against this family; I’ve sprinkled the powder into everybodies shoes at some point because I couldn’t quite determine which ones belong to the target, except for the current pair.
It turns out that the shop owners are fed up, too. While giving the landlord a report about what is not in our possession among the crap thats cluttering the entire basement and backside of the house and what segments of the floor I am not cleaning from nightly party leftovers (in this country neighbours are sharing the responsibility for keeping the floors and the entrances clean) he kind of complained about this family running down the worth of the property with their behaviour. I am 100% sure that they won’t change their behaviour after receiving that talk from the landlord, so the next step might very well be along the lines of eviction.
As empathetically as I have always been feeling towards that family for years: enjoying some quiet and peace for a bit sounds very alluring to me, especially now. So, I will probably use the powder until the bottle has been emptied and see how things will go.