For a foundation brush with dried product, soften the residue using lukewarm water and a little gentle cleanser, then massage only the bristles. Do not soak the entire brush or scrape at dried clumps.
Start with the surface
Gently wipe excess foundation against a clean, dry tissue. Hold the brush bristle-side down under lukewarm water. Make sure the water touches the hairs rather than running into the metal ferrule, which protects the glued joint.
Lift dried foundation gradually
Apply a modest amount of gentle shampoo or brush cleanser. Swirl the bristles in your palm or on a soft cleaning mat without pushing hard enough to spread or break them. Rinse and repeat as needed. A dense flat-top brush may need several rinses to clear the product hidden in its center.
Know when to stop
If the brush continues to release clumps, has a persistent odor, or the bristles remain stiff despite thorough rinsing, it may be time to replace it. Do not use alcohol, acetone, or aggressive degreasers without the brush maker’s explicit instructions.
Keep the brush usable longer
After every application, gently remove visible excess makeup with a clean tissue; then do the full wash routinely. Dry horizontally and avoid putting a still-damp brush into a closed holder.
Frequently asked questions
Can I leave the brush soaking overnight? It is better not to. Immersing the ferrule for long periods can weaken the bond that holds the hairs.
Why does the center stay damp? Dense brushes trap water between hairs. Give them generous ventilation and more drying time.
Source: American Academy of Dermatology — safe makeup-brush washing.
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