I have always done this with mites.
Remove snake and water bowl. Spray the tub with the aspen inside with pam. Wait till it dries. Put snakes back in. Put water bowls back in next day.
I am thinking about switching to cypress mulch. I could still treat as before, but the "wait till it dries" part becomes a problem, because unlike aspen, cypress mulch is damp out of thr bag. How will I be able to "wait till it dries" so to speak? I wouldnt be able to tell if the dampness is the pam or the moisture in the cypress. It would take days for the cypress to become dry.
Same question with coconut coir bricks.