Someone needs to get out more
As others have noted, this has been a common practice for as long as I've been around electronics (and that goes back to vacuum tube (valve) days. I've seen every thing from dishwashers to the shower used. Also echoing the key point everyone raised: get it dry before powering it up. My preference is to set it in the direct sunlight all day since my part of the world typically runs 85-90F with relative humidity in the low teens. Using the dishwasher drying cycles does create some interesting geometry, though.
Biting the hand that feeds IT
