Add the liquid castile soap to the lukewarm water and stir to combine. It's important to use lukewarm water as too hot water may melt the glue that holds the bristles of your makeup brush in place.

Place the bristles in the soapy solution and swirl a few times to loosen the old makeup. .

Keep going until the brush looks clean, and then rinse in some clean lukewarm water.

If you want to ensure all the soap has been removed dip your brush bristles in a small jar of white vinegar. White vinegar is amazing at cutting through soap, leaving your brush super clean. Once your brush is dry it won't smell of vinegar, as vinegar dries without an odour - trust me!

Whether you rinse your brush in water or vinegar, next you need to mould the brush back into shape, and then leave to dry on a flannel.

Viola, naturally clean makeup brushes with very little effort!