Who are your questions to?It's completely nuts to worry about dirt in the drawer anyway - why would it be a problem? Because it's going to go into a big machine along with a load of dirty clothes? A machine whose sole task is to take a load of dirty stuff, and remove the dirt from it? So ... do you clean and dry your clothes too, before you put them in the washing machine? So as not to get dirt in your washing machine?
It's like washing your hands before doing the washing up.