How to Clean a Chemex and Remove Coffee Stains

That brown ring at the bottom of your Chemex is not just cosmetic. Coffee oils cling to glass, turn stale and can add a flat, bitter edge to your next brew. Here is how to clean a Chemex the right way: a quick rinse after every brew, a weekly wash with the collar off, and a simple soak when stains or cloudy hard-water film build up. Chemex itself says the glass is dishwasher-safe once the wood collar and leather tie are removed.

If you are still learning to brew with it, start with our Chemex brewing guide. This page is only about keeping it clean.

Key takeaways

• Rinse with hot water right after brewing, before oils dry.
• Remove the wood collar and leather tie before washing by hand or in the dishwasher.
• Baking soda lifts coffee stains; white vinegar or citric acid dissolves hard-water film.
• Never microwave the Chemex, and avoid knocks against other dishes.

In this article

1. The daily rinse
2. How to clean a Chemex weekly
3. Removing coffee stains
4. Removing cloudy hard-water film
5. Wood collar and leather tie care
6. FAQ

The daily rinse (30 seconds)

1. Lift out the used filter and compost it with the grounds.
2. Pour about a cup (240 ml) of hot tap water into the carafe, swirl for 10 seconds and dump it.
3. Repeat once, then stand the Chemex upside down on a rack, or upright in a spot where air reaches the inside.

Doing this while the glass is still warm prevents most stains. Coffee oils are easy to rinse off when fresh and stubborn once they have dried for a day.

How to clean a Chemex weekly

Once a week, or every few brews, give it a proper wash.

1. Remove the collar. Untie the leather tie and slide the wood collar off. Set both aside on a dry towel.
2. Wash with warm soapy water. Add a drop of unscented dish soap and warm water. Swirl, then scrub with a long, soft bottle brush. Chemex sells a brush shaped for its carafe; any soft bottle brush that reaches the bottom works.
3. Rinse well. Rinse three times with hot water. Leftover soap shows up as a faint film and a slight taste.
4. Dry and reassemble. Air-dry upside down, then refit the collar and tie.

Can you put a Chemex in the dishwasher?

Yes, according to Chemex’s own support page, the glass coffeemakers can go in the dishwasher once the collar and rawhide tie are removed. Place it securely on the top or bottom rack so it cannot knock against other dishes, which is the main breakage risk.

How to remove coffee stains from a Chemex

Brown or amber stains build up in the bottom bulb and along the pouring spout. Pick the method that matches the stain.

Avoid steel wool, scouring powders and abrasive pads. They can scratch the glass, and scratches hold oil and stains even faster afterward.

Removing cloudy hard-water film

If your Chemex looks cloudy or white rather than brown, you are dealing with mineral scale from hard water, not coffee oils. Baking soda will not shift it; you need a mild acid.

1. Fill the carafe to the bottom of the cone with a 1:1 mix of white vinegar and warm water, or 1 tablespoon of citric acid dissolved in warm water.
2. Let it sit for 20–30 minutes.
3. Brush, then rinse at least three times to remove any vinegar smell.
4. Brew a plain hot-water rinse before your next coffee.

Using filtered water for brewing slows scale build-up and usually improves flavor too. Our guide to the best water for coffee explains why.

Wood collar and leather tie care

Chemex describes the collar and bead as rubber wood and the tie as full-grain leather. Neither should be soaked.

• Wipe the collar with a damp cloth if coffee drips on it; let it dry fully before refitting.
• If the wood looks dry after many months, a light coat of food-safe mineral oil restores it.
• Keep the tie dry; if it gets soaked, let it air-dry naturally, away from direct heat.
• Glass-handle models have no collar; clean them like the carafe.

Five cleaning mistakes to avoid

• Leaving the filter in overnight. Wet grounds stain the bulb and can grow mold.
• Washing with the collar on. The wood swells and the leather stiffens when soaked.
• Using scented soap. Fragrance can linger on glass and show up in the cup.
• Plunging a hot carafe into cold water. Let it cool a little first to be gentle on the glass.
• Skipping the final rinse after vinegar. A sour, sharp note in your next brew is the giveaway.

A simple Chemex cleaning schedule

Coffee worth a clean Chemex

A spotless carafe lets delicate flavors come through, which is exactly why the Chemex suits bright single origins. Try Ethiopia Natural from Sidama for fruit and milk chocolate, Kenya for orange, lemon and floral notes, or Colombia for a balanced cup with berry and chocolate. Order whole bean and grind medium-coarse just before brewing.

How to clean a Chemex FAQ

Can I use bleach to clean a Chemex?

There is no need. Baking soda, vinegar or a coffee equipment cleaner handle stains and scale safely, and bleach residue is hard to rinse out completely.

Why does my Chemex coffee taste stale even after rinsing?

Dried oils in the bulb or spout are the usual cause. Do a baking soda soak and a full soapy wash, then rinse well.

Can I put a Chemex on the stove?

Check the instructions for your specific model before applying any heat. Never put it in the microwave; Chemex advises against microwaving its coffeemakers.

How do I clean the Chemex spout?

Rub a small amount of baking soda paste into the spout channel with a soft toothbrush, then rinse.

Sources

1. Chemex. Classic Series Product Support. chemexcoffeemaker.com.

Facts checked in October 2026.

Keep reading: How to clean coffee-stained mugs · Drip vs pour-over · Single Origins