Does your makeup brush smell sour and musty? Learn proven methods to remove stubborn odor from makeup brushes, eliminate bacteria trapped in bristles and stop unpleasant smells from coming back.
How to Get Rid of Smelly Makeup Brushes & Remove Stubborn Odor Permanently
You pick up your favorite makeup brush, bring it close to your face, and immediately pull back. That sour, musty, rotten odor is impossible to ignore. Your makeup brushes smell bad — and wiping bristles on a tissue will never fix the problem. This unpleasant smell forms when bacteria break down trapped makeup residue, skin oils and moisture deep inside bristles. If you want to remove odor from makeup brushes for good, surface cleaning is not enough. Below we share reliable DIY solutions to get rid of smelly makeup brushes and prevent odors from returning.
What Causes That Bad Smell on Makeup Brushes
The stench is not just leftover makeup sitting on brush bristles. It comes from active bacterial growth. Microbes feed on accumulated facial oils, dead skin cells and cosmetic residue left after every makeup application. As bacteria break down these organic materials, they release gaseous compounds that create that recognizable foul smell. Warm, damp conditions speed up bacterial reproduction and make the odor stronger.
Brushes used for liquid and cream formulas are the biggest culprits. Foundation brushes, concealer brushes and lip brushes lock moisture deep within fibers with little airflow. This dark, humid space becomes an ideal breeding ground for bacteria. Powder brushes develop odor more slowly because powder absorbs excess moisture, yet surface bacteria still build up and create musty smells over weeks of use.
The longer you skip cleaning, the worse the odor grows. A makeup brush left unwashed for seven or more weeks harbors millions of odor-causing bacteria, which explains that strong rotten smell many people notice.
Why Wiping Your Brush on a Tissue Cannot Eliminate Odor
This quick hack is common among makeup users: finish applying makeup, blot the brush on tissue paper, then store it away. This simple step only removes roughly 10% of surface makeup. Most residue stays trapped deep inside bristles, and bacteria remain completely untouched.
The unpleasant smell originates inside the brush fibers, not just on the outer surface. Wiping on tissue offers only temporary cosmetic cleanup while bacteria keep multiplying. If your makeup brush still smells after blotting with tissue, the odor has embedded deep within bristles. You need proper cleaning techniques, not superficial wiping. Read our guide about
deep clean makeup brushes to understand the difference between surface blotting and thorough sanitization.
The Best Permanent Methods to Remove Odor From Makeup Brushes
No magic spray can erase bad smells without proper cleaning. The only lasting solution targets the root cause: kill bacteria and wash away the organic residue they feed on.
White Vinegar Soak Kills Odor at the Source
White vinegar contains mild acid that eliminates bacteria and dissolves biofilm — the slimy protective layer bacteria build to shield themselves from regular soap. Biofilm traps odor particles deep inside bristles, and ordinary cleansers often fail to break it down.
Mix one part white vinegar with two parts lukewarm water in a small bowl. Submerge only the bristle tips — avoid soaking the ferrule or wooden handle, which can loosen glue. Let brushes soak for 10 to 15 minutes. Vinegar neutralizes bacterial waste that triggers unpleasant odors. After soaking, rinse bristles thoroughly under running water. Follow up with mild shampoo to wash away lingering vinegar scent. Gently squeeze out excess water and lay brushes flat to air dry.
This method works for all brush types and delivers excellent results on neglected brushes with stubborn odor that regular washing cannot resolve. Be sure to follow
how to dry makeup brushes after washing to avoid mold and recurring smells.
Baking Soda Paste Draws Stubborn Odor From Dense Bristles
Thick, densely packed brushes such as flat foundation brushes, stippling brushes and packing brushes sometimes do not receive full penetration from vinegar soaks. Baking soda works differently: it actively absorbs trapped odor molecules instead of only killing bacteria.
Create a thick paste using two tablespoons baking soda plus a few drops of water. Spread the paste directly onto bristles and massage gently toward the base of the brush, where odor accumulates most heavily. Leave it for five minutes so baking soda pulls embedded odor particles out of fibers. Rinse completely under running water, then wash bristles with gentle cleanser to remove leftover baking soda residue. Dry fully before storage.
One treatment noticeably weakens bad smells. For heavily neglected brushes, repeat the baking soda process two to three times across several days to draw out deeply trapped odor.
Tea Tree Oil Neutralizes Smell & Prevents Odor Regrowth
Tea tree oil acts as a natural antimicrobial agent that kills bacteria, mold and fungi — the three primary sources of musty makeup brush odor. It also provides a fresh natural scent to mask faint leftover smells while cleaning works.
Add five to six drops of tea tree oil into your regular brush cleaning water. Swirl bristles normally within soapy water, then rinse thoroughly. Even after brushes dry, diluted tea tree oil continues inhibiting surviving bacteria, which makes this technique ideal for lip brushes, cream makeup brushes and tools used near your mouth, where bacteria multiply fastest.
Important reminder: Never apply undiluted tea tree oil directly to bristles. High concentrations gradually damage natural hair brush fibers. Always mix it into wash water or mild cleanser.
Quick Odor Removal Hacks When You Have No Time for Full Washing
Sometimes you need to reduce bad smells immediately without a lengthy soaking process. These shortcuts do not replace complete deep cleaning, yet they suppress odor enough for temporary use.
Rubbing Alcohol Wipes Kill Surface Bacteria Fast
Dampen a soft cloth with 70% rubbing alcohol. Wipe bristles firmly from base to tip. Alcohol instantly eliminates surface bacteria and dissolves oily residue carrying odors. It evaporates rapidly, so brushes become usable within minutes.
This hack works best on synthetic bristle makeup brushes. Limit alcohol use on natural hair brushes to once weekly; repeated applications dry fibers and make bristles brittle. Synthetic brushes safely tolerate alcohol cleaning regularly.
Freeze Brushes Overnight to Kill Odor-Causing Microbes
It sounds unusual, but freezing works well. Bacteria and fungi that create musty brush odors cannot survive freezing temperatures. Seal brushes inside a zip-lock bag and place them in the freezer overnight. Cold temperatures neutralize most odor-causing organisms. The next morning, let brushes thaw at room temperature for 30 minutes, then wipe bristles lightly with clean cloth.
Freezing drastically reduces unpleasant smells, though it does not wash away makeup buildup. This method buys extra time between formal cleaning sessions and performs great for rarely used special occasion brushes that develop stale odors sitting in drawers.
Dry Coffee Grounds Absorb Lingering Odors Between Washes
Everyone knows dry coffee grounds absorb unwanted household odors, and the same principle applies to makeup brushes. Place one tablespoon of dry coffee grounds inside a small container. Bury brush bristles inside the grounds for roughly ten minutes, then shake off loose particles. Coffee grounds draw residual odor molecules trapped within fibers.
This is a temporary solution and cannot substitute actual washing. Still, it performs wonderfully for brushes with mild musty smells that remain visually clean. It is safe for all brush styles, including delicate natural hair bristles.
How to Stop Makeup Brushes From Smelling in the First Place
Treating odor after it develops is reactive maintenance. Preventing bacterial growth from the start saves time and protects your skin.
Never Store Brushes While Still Damp
This is the top cause of recurring makeup brush odor. Combine leftover moisture, makeup residue and dark enclosed storage, and bacteria multiply rapidly within hours. Always confirm brushes are 100% dry before putting them away. If bristles feel slightly damp, they are not ready for storage. Lay brushes on a clean towel in a ventilated space and air dry for a minimum of six hours; overnight drying delivers better results. Learn more about
how to store makeup brushes properly to avoid mildew and bad odors.
Wipe Brushes on Clean Tissue After Every Single Use
This simple routine takes only five seconds. After each makeup application, press bristles against clean tissue to remove fresh product and facial oils before they harden inside fibers. Dried makeup creates food sources for bacteria. Removing residue while still wet limits bacterial fuel and slows odor formation.
Replace Brushes Before Persistent Odors Develop
All makeup brushes have a usable lifespan. Synthetic fiber brushes last 1–2 years with proper care, while well-maintained natural hair brushes remain usable for 3–5 years. Over time, bristles degrade, adhesive weakens, and bacteria settle deep inside fibers where cleaning cannot reach them.
If your makeup brush still smells terrible after vinegar soaking and baking soda treatments, it has reached the end of its service life. Permanent bacterial colonization means the tool cannot be fully sanitized. Swap it for a new brush — fresh makeup brushes protect you from breakouts and skin irritation caused by stinky contaminated tools.
