I asked the OKW housekeeping once if they did this, and they do clean it with the tub full and using a disinfectant. What I am not sure they do is rinse the jets out afterward, so I reccomend doing a "rinse" tub full and run the jets a bit. If you aren't sure the housekeeping actually did their job, just fill the tub and run it with a small amount of auto dishwasher soap followed by a second fill and running with plain water.