Next best thing to getting someone to clean for you would be to have that person keep an eye on things and maybe just slide a tub open for a few minutes to get fresh air in the tub; a fan in the room to keep the air moving may help too.

FWIW, I left for a week and came home to some dirty tubs, without any ill affects. Try doubling up on layers of newspaper too to absorb as much liquid as possible.