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I think it's both those things @small1axe...

LOL , you might wanna check your workout dungeon for blood sucking dog-bats .
They seem to thrive these days and shit on our things .. ;-)

I heard that bats shit on themselves, because they hang upside-down... Is that true???

yeah , but it dos not stick somehow .
And i have to confess something here ,....
Last summer in Greece i slept in a bats invested abandoned old stone farm-house for some nights . Then a guy from England gave me a ride to the airport , he left Greece one week later , to London .
And now we have English-covid ..... i am so sorry , good thing they did that Brexit , so it won't spread that fast . ;-)