Turn off power to the tub
Fill the tub with warm water until jets are covered
Add a whirlpool tub cleaner or a cup of white vinegar
Run the jets for 15 to 20 minutes
Drain the tub completely
Refill with clean water
Run the jets again for 5 to 10 minutes
Drain the tub again
Wipe the tub surface with a soft cloth and mild soap
Clean around the jets with a soft brush or cotton swab
Rinse the tub thoroughly
Dry the tub with a clean towel
Repeat monthly or as needed