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Acrylic tubs can fade or turn yellow over time due to thick layers of accumulated dirt, hard water deposits from minerals, and shampoo or soap dyes. Also, as an acrylic tub ages, it may become dull or change color due to changes in the acrylic itself.

There are a few ways to check whether your tub is fiberglass or acrylic. If your tub is a color other than white, then your tub is likely acrylic (as fiberglass tubs are usually white). Check to see if there is discoloration on the bottom of the tub, because if it’s yellowed, then you can be fairly sure it’s fiberglass.

Also, fiberglass tubs have thinner edges and are cool to the touch. Acrylic, on the other hand, is either room temperature or warm to the touch.

Surprisingly, cleaning an air bath is almost as easy as relaxing in one. Most air baths have a self-cleaning or drying cycle to remove moisture from the inner tubing. This prevents mold and keeps the tub ready for your next soaking session. For deeper cleaning, use mild soap and a soft cloth to wipe the surfaces and periodically clean the air jets as the manufacturer recommends.

When buying caulk, look for ones labeled for tub and tile. These have either acrylic latex or silicone compounds. This allows the caulk to stick to smooth surfaces and prevent mildew from forming.