I rented an old house this summer (the house is about 50 years

>>927993
bleach spray everywhere

Call landlord. If you've been using the sink and shower already, then the only thing left to stink is the toilet's wax/rubber ring.

Does it smell like sewage/shit or just musty/mold? It could be leaking water in a wall I guess.

>>927999
Sewage shit I'm afraid. And I'm pretty sure it's coming from the toilet.

>>928000
Still, call landlord, it's not your job. Sincerely a land lord.

>>928000
We have a breathing tube from the sewage system that goes to the roof. It freezes in the wintertime so that it doesn't breathe and this leads to sewage fumes inside! Sweet smells I tell you ya!

Is the toilet caulked to the floor? If not remove the toilet and scrub the pipe.

>>928000
Actually, sewage is a much better smell than mould. Sewage is just a pipe that isn't airtight, should be fixable. Should be three possible places (toilet, shower-drain or sink). Mould, you're talking ripping everything out including walls and hopefully it hasn't spread to other parts of the house.

>>927993
The wax ring under your toilet needs to be replaced.

Draino everything. Also pour used oil, bacon grease, 5w-20, and lard down the drain to keep them lubricated

>>928059
Depending on where you live. Mold comes from water. If you live in a place where you can remove the water that's all it takes and the mold dies. Still good to bleach it though

>>927993
If it has a crawl space might go look to see if shower has a trap, my didn't.