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A bathtub liner is a one-piece insert that goes on top of your tub to conceal cracks, blemishes, and discoloration. Liners are made from acrylic or PVC plastic. It’s best to purchase a custom bathtub liner that matches your existing tub's size, shape, and contours, but premade liners are less expensive and also get the job done. Some bathtub liners come with a wall or shower surround to refurbish the area above the bathtub.

Rust should be pretty easy to identify in your bathtub, as it has a dark red, brownish color, and it sits on the surface of the porcelain. It usually appears around metal fixtures, like under your tub spout or shower head, and you might also find it under metal shaving cream cans or razors that you leave sitting on the tub or a shower shelf.

When it comes to cleaning bathrooms, bleach usually comes to mind. But like ammonia, bleach can damage acrylic tubs. In fact, many tub manufacturers warn against using bleach on acrylic bathtubs, and doing so could void the warranty on your tub. Again, a gentler cleaner specifically made for acrylic tubs, or one of the homemade methods listed above, is your better bet here.

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.