It is actually pretty simple to clean jacuzzi jets and this should be done regularly to prevent any scum buildup. The easiest way is to fill your tub with hot water to a level right above the jets. You can then add 1/2 cup of bleach and a tablespoon of powder Cascade to the water. Run tub for about 15 minutes. Empty the tub and fill with clean water and run for about 10 more minutes. This should keep everything sparkling clean.