Here are a few simple steps to cleaning those jets.
1. Fill tub with hot water to a couple inches above jets.
2. Pour in about a half cup of bleach and a tablespoon of powdered cascade dishwashing detergent
3. Run the jets for 15 minutes with the air knob thing open all the way so it gives the highest turbulence
4. Empty tub.
5. Refill with cold water to above jets.
6. Run jets to rinse – 10 minutes Do this twice a month.