Consider this sequence. Get the chain back up on deck
, and while it's out of the locker flush the locker with MILD bleach water
The ideal tool for then cleaning
the dried algae off the chain may be a pressure washer, hitting one side, flipping it, hitting the other. But washing
chain can be tedious - there seem to be no end of places for the stuff to hide.
An alternative might be to soak the chain in 1:10 ammonia:water. I can't recommend bleach for this step, because bleach attacks galvanized steel
A third approach might be to wait for stench removing advice from Peggy Hall, the Princess of Poop and the forum's specialist in everything that doesn't smell good.