Every month or so, my apartment building sends someone to knock on every door of the (admittedly small) building to offer to spray a few places (like behind the

Every month or so, my apartment building sends someone to knock on every door of the (admittedly small) building to offer to spray a few places (like behind the stove) to keep out pests. I hadn't thought of it from this perspective before, but it makes sense from the perspective of trying to solve the problem you mention; the only way to keep them out is to handle it uniformly across all the units, and having someone come around to offer it every so often makes sure that new people moving in get it treated and no one will forget due to having to remember on their own.