Your sponge should be damp, not soaking wet. [1] X Research source

Reusable sponges are very absorbent. To remove all of the makeup, you may need to apply soap and rinse the sponge several times. Some reusable sponges, also called makeup blenders, are sold with specially formulated liquid cleansers. Cleaning these sponges with gentle baby shampoo or dish soap will not result in damage. [2] X Research source

The sponge should be completely dry before you use it again.

Some reusable makeup sponges, often called makeup blenders, are sold with solid soap cleansers. You will not damage these products by cleaning them with gentle, scent-free soap. [4] X Research source

You may also rub the sponge over the bar of soap. Make sure to rinse all of the soap out of the sponge. [5] X Research source

You can also put the sponge inside of a mesh bag and throw it in your washing machine on a rinse cycle.

Store your sponge in a cool, well-ventilated, and well-lit space. Do not keep your sponge inside a drawer, medicine cabinet, or sealed cosmetic bag. Keep your sponge on your bathroom counter in a clean soap dish. This storage method will expose your sponge to fresh air and bacteria-killing light. When you travel, keep your sponge in a separate mesh makeup bag. Do not throw your absorbent and soft beauty tool into a bag full of makeup, germs, and sharp corners.

Wash your reusable sponge at least once a week. If you are prone to breakouts, wash your sponge after every use. In addition, during a pandemic like COVID-19, you should clean and sanitize your sponges and other tools after every makeup application. [8] X Expert Source Tymia YvetteMakeup & Lash Artist Expert Interview. 23 April 2020. Replace your eco-friendly sponge every 3 to 4 months. [9] X Research source

If you are looking for a reusable sponge, purchase a microbial-resistant foam sponge or blender. [10] X Research source