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After the last run for the day 1.
Take a scoop of quartz sand and put it in your vessel(s) and run it as you would a sample for several minutes (~3 min should be adequate).
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Remove the vessel and empty out the sand. Scrub the pieces with tap water and a scouring pad and rinse with DI water. Dry with a Kimwipe, and then spray with isopropyl alcohol and wipe down with Kimwipes. If your vessel is particularly dirty run a combination of quartz sand, a little hot water and detergent (Borax). This can be run for several minutes. A thick paste will form and then you clean it as normal.