Reminds me of 2 things.
One was a book about a secret weapon called the “Bat Bomb” in WWII. It was a fun read. One episode that I recall was that there were some idiot photographers who went into the bat cave to take pictures, against advice from the team. Everyone left them in there, and when they turned on the lights to take pictures, millions of bats defecated. They were covered in it.
Second thing it reminds me of is a scene in some western movie where Christian Slater said something like, “I’ve been to Gold [mining] towns, silver towns, heck even salt towns. But I ain’t never before been to a bat sh!t town.”
in case you wanted to know, the movie was young guns 2.