I always use the bleach and dishwasher detergent method. I don't have a whirlpool bathtub at home, but, do have a hot tub and a few years back when we had our hot tub serviced the repairman told me a story about a jacuzzi tub in a resort (not Disney) which really grossed me out and made me glad I do so all the time when staying somewhere. With either a hot tub or whirlpool bath, some of the water from the previous bather(s) actually lays in the lowest part of the tubing until next used. Therefore, when you don't clean the jets with a sanitizer you are literally "taking a bath" with whomever was in that tub before you.........no thanks!!!