The most important thing you can do for oily skin is keep it clean using an oil-free cleanser, according to MedlinePlus, a service of the U.S. National Library of Medicine. Making homemade facial cleansers for oily skin ensures that you don't use any irritating ingredients that may worsen the condition. In her book “Naturally Skinsational,” Sue Dolan recommends cleansing oily skin with an astringent substance, such as witch hazel extract or apple cider vinegar. Combined with a gentle soap and humectant, these ingredients clean the pores and remove excess oil without stripping the skin of its natural attributes.
Add the liquid castile soap and vegetable glycerin to a small mixing bowl. Stir until well combined. This mixture forms a gentle base for natural facial cleansers.
Add the witch hazel extract, a natural astringent that helps reduce excess oil production. Stir into the soap and glycerin mixture until well combined.
Stir in the apple cider vinegar, another natural astringent that helps balance the skin's pH levels and prevents excess oil production.
Add the essential oil, and stir again to combine. For oily skin, choose a citrus-based essential oil such as lemon, orange, neroli, grapefruit or lime. Cypress or eucalyptus oil may also benefit oily skin.
Transfer the homemade facial cleanser to a glass or plastic storage bottle, and store in a cool, dry place. To use, gently massage into the face using circular motions with your fingertips, and rinse with tepid water.