I am constantly picking chunks of what I'm told is called "elephant snot" out of my hulls. Also aluminum shavings, and some misc other crap. Armed with a hose, the incline of my driveway, and no rain in the forecast, I proceeded to partially flood both hulls and rinse most of this stuff out. It probably doesn't matter one bit, but it always annoys me when I find this crap when sponging out what little water does get into my hulls.
Left the port covers off yesterday and today, so she's probably bone dry again.