Most questions answered, no. 2

Or, The Return of the Pot Boy,
who has received the following question:


DAVID R. said...
Dear Potty
[sic] Boy--I wash my dishes in a sink and use the standard drying apparatus. Now, why is there always gunk accumulating in the bottom of the utensil drying bin though I just washed the pieces?
Note from Marly: As David R. is part of a lively group of fb-teasers, I hope he will not take it amiss