A quick, cheap DIY treatment anyone who struggles with oily skin can do.

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Mindy Kaling, author, actress, and style icon, just revealed one of her best beauty secrets. Not the least bit self-conscious, she posted a picture of herself covered in the grey goopy mask to Instagram.

"Sometimes I put glop on my face for beauty reasons. This one was cheapo and fun to mix and really worked. I don't get paid by them or anything!" she wrote in the caption to her 1.8 million followers.

The products pictured: apple cider vinegar, a jar of Aztec Secret Indian Healing Clay, and a hot pink mixing bowl. It was her "mega oily skin" and the advice of her trusty hair and makeup team that led her to this DIY concoction in the first place, she added.

The "secret" ingredient in the mask is 100% bentonite clay, and in fact, it is great for deep cleaning pores and controlling sebum production. When mixed with Apple Cider Vinegar (ACV), the clay liquifies and develops into a creamy consistency, ideal for applying as a face mask. You can use water with the clay powder, but ACV is recommended for its anti-bacterial qualities that have the added benefit of helping to prevent acne breakouts.

Try Mindy's Mask

You'll need:

  • 3 Tsp. Aztec Secret Indian Healing Clay ($8, amazon.com)
  • 2 Tbsp. Apple Cider Vineger ($6, amazon.com)
  • Non-metal bowl (Because of the negative charge in the bentonite clay, which is what pulls out dirt and oil, using a metal spoon or bowl can put a positive charge on it, making it ineffective.)

Mix the two ingredients together and apply allover your face, paying close attention to your problem areas. Leave it on for 15 to 20 minutes before rinsing. As the clay hardens, you will feel a slight tightening feeling, that's good! That means that the impurities are being drawn out of your pores and you'll be left with softer skin and a brighter complexion.

If you have combination skin, it's best to apply the mask only to your greasy areas, typically the t-zone, so that you're not stripping your skin. If oily skin is not a problem, or if your skin is more sensitive, you should stick to a less intense mask—this one may leave your skin too dry.