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I just spent a long time creating a post and it didn't save! I don't have time to retype it all but basically 150 year old house, second floor, this is the room that has attic access, bats & baby bats in here every summer, also hear critters running between 2nd floor / 1st floor ceiling every night, (almost erradicated) carpenter ant issue, whole house has been completely updated, this room is basically the only unfinished room, has been used as storage (but frequented), cats and maybe the dog come in here sometimes...

Also, can anyone help identify what the powdery stuff is, that the tracks are laid in? Thought something must have spilled, I shook off some stuff and it shook off like powder.... then I realized it must be a fungus because it's behind & under things too... been sick so I'm all congested and can't smell anything but I think my throat feels irritated since being in that room (if not just imaginary). The exposed wood, in the photo, is from where I picked stuff up off the floor

Hoping Reddit will come to the rescue and be more promising than the last 4 hours of Googling was. Any advice for the cleanup I'm about to embark on when I get home from dropping kids off at school?

Thank you so much!!!!