Cleaning the exposed surfaces of a jetted tub is much like cleaning a standard bath. Always use an appropriate cleaning agent for the tub material to prevent scratching or dulling the finish. But jetted tubs need more than a surface cleaning; their jet piping and pump system can hold contaminated bath water, promoting growth of potentially dangerous bacteria that can be circulated into the bath. Routine flushing of the circulation system is your best defense. If you miss cleanings, or if you've just moved into a home and don't know how the tub was maintained, more serious sanitizing may be in order.
Use a general household cleaner or bathtub cleaner to clean your tub once a week or after each use. Whatever you product you chose, be sure it is non-abrasive since that may scratch your jetted tub's surface. Use a rag or sponge to scrub your bathtub clean. Rinse well.
Cleaning the Jet System
Your owner's manual should specify how to clean the jet system. One common technique is to fill the tub with hot water (up to 140 F) up to a couple of inches above the jets. Add 1/4 cup of powdered dishwasher detergent and 1/2 cup of bleach. Run the jets for 15 minutes; drain. Refill with cold water and run the jets again for 15 minutes; drain. Repeat this process once or twice monthly.
For more thorough sanitizing of the jet system, consider using a biofilm cleaner designed for jetted tub and spa systems, or hire a professional spa cleaner. If biofilm has developed in the piping or related parts, bleach and household cleaners are likely to prove ineffective.