We use a salt-water electric pump powered hose, with a trigger release on the nozzle, and manually spray the chain before it reaches the roller. It uses the same pump as the galley salt water tap. We find this adequate for mud and clay, and it tends to properly wash the chain and not leave too much sticking as a brush might. Just requires a bit of concentration to make sure you get in between each link... it's also convenient for washing the decks down afterward to get rid of any bits we missed.
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Sailnet Disclosure: Craig is the son of the designer of Rocna and has a financial interest in its success.