If your hair has a lot of build-up or is starting to feel dull, limp, or worse, dirty, even after washing it, it may be time to try a purifying shampoo. These cleansing agents are not for everyday use—at most they should be used once a week to keep from stripping the hair’s natural oils. Here’s how to incorporate our picks into your styling routine.

Perfect Before Dye Jobs

This is non-staining and safe whether you’re au natural or bleached blonde.

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The golden rule of purifying shampoo is to use it before getting any hair color done. This will ensure the color will deposit well on your hair, avoiding any mineral or product build-up. But don’t use it on the same day you’re getting color—use it about two days before.

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Available in two sizes—33.8 fl. oz or 13.5 fl. oz.

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If you find yourself with bad hair day after bad hair day, using a purifying shampoo can simply act as a reset. It will remove any build-up that may be causing your hair to misbehave, tame your tresses, and create a clean, blank slate. It’s best to let your hair dry naturally after cleansing with a purifying shampoo.

Enhances Volume

Deeply cleanses the scalp, creating a thicker look.

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If you have fine, straight hair that you wash often or else it just goes limp, purifying shampoo is the pick-me-up you need on occasions you want bigger, bolder hair. Because it’s light and cleans deep, skip the conditioner and watch your hair bulk up. But for non-oily hair, don’t use purifying shampoo regularly, as it can really dry your hair out.