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Because there's some exposed insulation material, could it just be a kind of musty chemical smell from them?
yes this certainly a possibility and what i initially thought could be the problem.. how should i go about remedying it though?
Or - and this is not the answer you want - could it be rats coming through that hole?
super unlikely imo. i lived in somewhere with rats (uni days) and smell is different. there also arent any droppings/food for them to seek
the cat is just curious about absolutely everything and follows me around all day haha
Because there's some exposed insulation material, could it just be a kind of musty chemical smell from them?
Or - and this is not the answer you want - could it be rats coming through that hole?
We had rats under the kitchen and hall floor for a little bit, thanks to a strange pipe that led somewhere outside and then stopped under the kitchen.
The main clue to that was a strange smell that wasn't always there, but I think was made worse by the fact that their way up involved a sewer.
That could also explain the cat's interest.