One of my 256MB compact flash cards containing some photos went through the wash. It was a colours cotton wash at 40 degrees with a spin cycle at the end and then into the tumble dryer for 60 minutes or so.
It still seems to work perfectly, though some of the colours in the photos look a little lower saturated (read: ‘washed out’). If this were a floppy disc I’d expect extreme data loss (though, at 1.44MB, that’s less that one lost photo), and when I’ve washed CDs before, they were completely destroyed.
I bet if this were a microdrive it’d be broken too.