If you have a jetted or garden tub, Jetta Corp. advises that you clean your tub exclusively with a damp cloth and window cleaner. Never use any sort of solvent, as it could damage your tub. The company also advises against using bubble bath or bath oils in your Jetta® tub.
To thoroughly clean your whirlpool every two or three months, fill the bath with warm water and add a small amount of liquid dishwasher detergent. Circulate the water for 10 minutes and drain. Refill with cold water. Circulate for another 10 minutes and drain.
To improve the tub's luster, you can use an automotive wax or a wax recommended for plastic surfaces. Minor scratches and abrasions can be removed and the original gloss restored by using a light buffing compound.