TL;DR
A brass mouthpiece is cleaned with warm, never hot, water, a little mild dish soap, and a mouthpiece brush run through the bore. Hot water can damage plating and the lacquer on the instrument it connects to, and a mouthpiece is the one part of a horn that should be cleaned weekly rather than seasonally.
Why the mouthpiece specifically
Everything you eat, drink, and breathe passes through the mouthpiece before it reaches the instrument.
Residue builds up as a film inside the bore, the narrow throat where the mouthpiece narrows. That throat is a precise dimension, and a buildup there changes how the instrument responds and how much resistance you feel.
It is also the part that touches your lips, which is reason enough on its own.
Cleaning it takes two minutes and it is the highest-value maintenance on a brass instrument.
How do you clean a brass mouthpiece?
Rinse it in warm running water, then work a mouthpiece brush through the bore from the shank end with a small amount of mild dish soap. Scrub the cup and the rim, rinse thoroughly under warm running water, and dry it completely with a soft cloth before storing.
What you need
- A mouthpiece brush, sized for your instrument
- Mild dish soap
- Warm running water
- A soft cloth
A mouthpiece brush is the specific tool. It costs very little and nothing improvises well, since a pipe cleaner is too small and anything metal risks scratching the bore.
The step-by-step
1. Use warm water, never hot. Hot water can loosen the lacquer on a lacquered instrument and stress silver plating. Warm is enough to dissolve residue.
2. Rinse the mouthpiece first. Get the loose material out.
3. Add a small amount of mild dish soap to the brush or the mouthpiece.
4. Push the brush through from the shank end, the narrow end that goes into the instrument, and out through the cup. Twist as you go. Repeat a few times.
5. Scrub the cup and rim with the brush or a cloth.
6. Rinse thoroughly under warm running water. Soap residue tastes bad and irritates lips.
7. Dry completely with a soft cloth, inside and out.
Do the shank exterior too, since a dirty shank is a stuck mouthpiece waiting to happen.
What not to do
Do not use hot or boiling water. It risks plating and lacquer.
Do not put a mouthpiece in a dishwasher. Heat and harsh detergent damage plating and can leave a residue.
Do not use bleach, alcohol, or abrasive cleaners. They attack plating and finishes, and a mouthpiece goes on your lips.
Do not use metal polish inside the cup or bore. It leaves residue in a place you cannot fully rinse.
Do not force a stuck mouthpiece. Pulling or twisting a stuck mouthpiece bends the receiver and the leadpipe. A repair shop has a mouthpiece puller and it is an inexpensive service. Never use pliers.
Silver, gold, and raw brass
Silver-plated mouthpieces tarnish, which is cosmetic. A silver polishing cloth on the exterior is fine. Keep polish out of the cup and bore.
Gold-plated mouthpieces are softer and need gentler handling. Wipe with a soft cloth and avoid polish.
Raw brass oxidizes and some players prefer it that way. Soap and water is all it needs.
Some players find silver plating irritates their lips, and gold plating is the usual alternative. That is a fit question rather than a cleaning question.
How often should you clean a mouthpiece?
Weekly for regular playing, and rinse it with warm water after every session. Residue in the throat builds faster than most players expect, and a mouthpiece that has gone months without cleaning will feel noticeably different once the bore is clear.
Rinse your mouth or brush your teeth before playing, and do not play right after eating. That single habit cuts buildup dramatically.
Do not share a mouthpiece. Everyone gets their own, and a player borrowing an instrument brings their own mouthpiece.
The instrument itself
The mouthpiece is a weekly job. The instrument is a periodic one, and it varies by horn.
Valve instruments need the valves and slides cleaned and oiled or greased on a schedule. Valve oil goes on the valves, slide grease on the slides, and the two are not interchangeable.
A bath is the traditional full clean for a brass instrument: lukewarm water in a tub, a mild soap, and a flexible snake brush through the tubing. It should be done carefully, and never with hot water. Some instruments and some finishes should not be bathed at all.
Do not bathe a silver-plated instrument in the same way you would a lacquered one without checking the manufacturer, and never immerse an instrument with felts and corks that would be soaked.
If you are unsure, a repair shop chemical clean is inexpensive, thorough, and safe.
Wipe the exterior after every session with a soft cloth. Skin oil is acidic and it etches lacquer over time.
Source: National Association for Music Education and manufacturer instrument care guidance
Woodwind mouthpieces are different
Do not treat a clarinet or saxophone mouthpiece like a brass one.
Hard rubber mouthpieces discolor and degrade with hot water and with many cleaners. Lukewarm water, a mild soap, and a soft mouthpiece brush, then dry completely.
Never use alcohol or a strong disinfectant on a hard rubber mouthpiece, which turns it brown and dull.
Reeds are separate, and they are consumables that get rinsed, dried flat, and replaced rather than deep cleaned.
Cases and storage
Store the mouthpiece in its slot in the case, not loose in a bag where it gets dented. A dented rim is uncomfortable and a dented shank will stick.
Vacuum the case interior occasionally. Grit in a case ends up against plating.
Do not store an instrument in a hot car or in an unheated garage. Temperature swings are hard on lacquer and on the felts and corks inside, the same environmental logic that matters for a piano in how to clean piano keys without water and for drums in how to clean drum heads and hardware.
Keep the case latched. An unlatched case that gets picked up is how instruments get destroyed, and that has nothing to do with cleaning and everything to do with keeping one alive, the way most gear in our guide to cleaning tools and equipment around the house survives on storage habits more than on cleaning.
FAQ
Can you put a brass mouthpiece in boiling water?
No. Hot and boiling water can loosen lacquer on the instrument, stress silver plating, and is unnecessary anyway. Warm running water with a little mild dish soap and a mouthpiece brush removes residue effectively. Rinse thoroughly and dry completely afterward.
How often should you clean a brass mouthpiece?
Rinse it with warm water after every playing session and give it a full clean with a mouthpiece brush and mild soap weekly. Residue builds in the narrow throat faster than most players expect, and a clear throat changes how the instrument responds and feels.
What do you do about a stuck mouthpiece?
Take it to a repair shop, which has a mouthpiece puller and can remove it in minutes. Do not pull, twist, or use pliers, all of which bend the receiver and leadpipe and turn a small service into an expensive repair. Preventing it means keeping the shank clean and never wedging it in.
Can you use a dishwasher on a mouthpiece?
No. Dishwasher heat and detergent damage plating and can leave residue in the bore. Hand washing with warm water, mild dish soap, and a mouthpiece brush takes two minutes and does a better job without risking the finish.
Is it safe to share a brass mouthpiece?
Everyone should have their own. A mouthpiece contacts the lips directly, and sharing one passes along whatever is on it. When borrowing an instrument, bring your own mouthpiece. Schools and ensembles that rotate instruments should assign mouthpieces individually.
How do you clean a silver-plated mouthpiece?
Wash it the same way as any brass mouthpiece, with warm water, mild soap, and a mouthpiece brush. For tarnish on the exterior, use a silver polishing cloth. Keep polish out of the cup and bore, where it cannot be fully rinsed, and never use abrasive cleaners on plating.
Instruments live in rooms that need their own upkeep. If keeping up with the rest of the house is the harder job, get a quote or read more about house cleaning services.