Gel Gloss is the recommended cleaner for all tub surfaces, use it about once a month, and then clean with a towel and water between after each use.
As to the Whirlpool system, we recommend automatic dishwashing soap. After your bath, get out and make sure the water is above the top jet, then pour a cap full of cleaner into the water, run the whirlpool for about 10 minutes, then turn off and empty tub. Dry with a towel and repeat about once every 6-weeks.