You should see what I’ve seen in France!

I now realize a lot of the bad bathroom smells are because of traps siphoning dry. Tho the general lack of exhaust fans doesn’t help. Anywho, AAVs to the rescue! And mineral oil in their version of a t&p valve if it doesn’t need to drain much to prevent evaporation of the trap water: https://fr.wikipedia.org/wiki/Groupe_de_s%C3%A9curit%C3%A9

And the wiring. Don’t forget the wiring. Bought a place that had a fault to earth. Took demolishing a wall to find it - previous owner had buried an extension flex inside a wall, just concreted over it - and hadn’t even done that properly - mice had gotten to it, and it was a corroded piss-soaked mess.

I have a photo of the original breaker box that looks like bad AI, it’s so unspeakably awful - just this wild spaghetti of muddy corroded wires and parcel tape with bits of string and random breakers floating in midair at jaunty angles, connected sometimes to live, sometimes to neutral, sometimes across circuits, usually doing nothing. The earthing was purely accidental. I just ripped it all out, but not before the microwave bit me one rainy morning.