"I dusted Friday!"
I may have a partial explanation, if not a solution.
As is well-known, the "lower levels" follow the same warming and cooling cycle as any other rotating hardware in space. We rotate many times a day, plunging our "underfloor" fundamental attributes into searing solar heat, and interplanetary sub-zero cold at a greatly accelerated rate.
Mention was made upthread about lichen, with the implication that simple organisms would behave in this environment the way we have come to expect that they would behave on Earth.
But that may not be true. With the rapid temperature cycling in the most remote areas, an energy source is made available for the plain and simple, as well as a few extremophiles.
They could be adapting to a very different environment, and the rapid accumulation of curious material could be the result.
I do not have any suggestions about how to ameliorate this process, should it turn out to be problematic. We will have to keep monitoring the situation.
Office of the Imperial Weatherman
Well, there had been several hundred barrels of coffee down there.
We are missing three whole barrels out of the north storage area on D deck.
And with the mutated critters running pel mel around there, they might be connected.