I have Brought the beachside house that has the little bungalow out the back, my sims will not clean the dishes in the main sink and will always walk out to the bungalow to wash them I have even chan...
Perhaps try blocking the sink which you don't want your sims to use. Or buy a dishwasher, When there is a dishwasher the sims will always go use that because that is less work for them xD
