I clean my bilge in the spring. I've had good luck just filling water up to the scum line and throwing in some bleach. Leave it for a few days, then when you come back, most everything is pretty clean.
Drain it (This drains into sandlot during storage) and use a little soap and water and a tough bristle brush with a decent handle to get anything that is left. Rinse and drain again, then wet vac anything that didn't drain.
I've done the same with bilge cleaner with similar results.
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