My husband and I have recently noticed a faint ammonia like order on our front porch and emitting from the built-in drawers in our dining room. Our 2 story house was built in 1908, and has siding which the previous owners had put on - I don't know when but it was over 5 years ago. My husband thinks the smell might be from all the many feral cats in our neighborhood peeing in the gardens around our house (which is a nightmare if that is the cause of the odor). I noticed that the two areas in which we are smelling this odor are both areas where we have experienced water seepage during heavy rainstorms this summer. Rain came thru the walls and ceiling on the front porch and also in our kitchen (same exterior wall shared with the back of the built-in). We live in MN and it's been very cold here, so I can't imagine mold could grow, yet I'm finding in my research online that mold is precisely what could be causing this odor!
Does anyone have any suggestions? It's definitely not an overpowering odor but it's noticeable and disturbing to us. I'd like to discover the cause before it gets any worse.
Any advice is appreciated.