We have the same system in our flat in France. No need to clean (apparently) but every six months, I remove the power to the unit, take the rectangular "plug" off on top, and pour in about half a bottle of normal drain cleaner. Leave it for a half-hour or so, then replace the cap, restore power, and flush for a few minutes via the sink. We have had no problems with this great little product! Good luck.
Neil
October 2009
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