Extreme differences between the scenario you describe,Thick bird poop covered everything
and 'wiping' down walls, roosts, nests, ramps, etc.
I just scrape the big stuff off, it's all stained but not a biohazard(unless you lick it-haha!).
Stalactites-hold tight to the ceiling. Stalagmites, might reach the ceiling.like stalagtites or stalagmites or whatever those things are that you see in caves.
That's how I learned to remember it, when visiting a cave.