The Housemates wouldn't be very happy when they are faced with a filthy dirty house that they have to start cleaning.
But it would be a team effort and altogether, it shouldn't take more than a day.
But, if they do this, they will really have to bring in loads of dust, dirt and rubbish and all sorts of stuff. Make them work and shock everyone, right from the off.
I imagine that it would be a shock to everyone
But, why not mix things?
nodisharmony