I cleaned all floors and drawers in the bathtub before handling. And I've noticed that the subjects have crevices where water accumulates. I am not a fanatic of hygiene, but in a refrigerator there should be no gaps in which can collect moisture and dirt that can not be reached with a rag. The manufacturer recommends cleaning with a damp cloth, which I do not think in the long run but sufficient. Better to treat themselves to a full bath