"Fill the tub with hot water to at least three inches above the height of the jets. Add two to four teaspoons of powdered dishwasher detergent (or another low-foaming disinfectant). For a deep clean, you can also add up to one-half cup of bleach. Run the jets for 15 minutes, and then turn off and drain the bathtub. Refill the bathtub with cool water and run the jets for another 15 minutes. Drain again, and your jets should be free and clear of all the soap scum and germs that you’d rather not have joining you the next time you settle in for a relaxing bath."