How to Clean a Chemex - Grind Those Beans

By Alice · Updated May 2026

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Your Chemex makes gorgeous coffee, but that elegant glass carafe shows every sin — brown rings at the waterline, cloudy film from oils, mystery stains that make it look like you’ve never cleaned it. We hand-wash ours after every brew (takes maybe two minutes), and do a deep-clean with denture tablets once a month when the glass starts looking dull despite our best scrubbing.

Skip regular cleaning and those oils turn rancid, which means tomorrow’s Ethiopian light roast tastes like last Tuesday’s dark French. The wood collar can’t go in the dishwasher, and honestly, the narrow neck makes hand-washing with a bottle brush faster anyway. Let’s get that Chemex looking like new.

What you’ll need

Long-handled bottle brush (one that reaches the bottom without you wrestling it)
Dish soap — regular stuff, nothing fancy
Denture cleaning tablets (we use Polident, but store-brand works)
White vinegar (optional, for stubborn mineral deposits)
Soft sponge or microfiber cloth
Warm water
Dry towel or dish rack

Step 1: Remove the collar and tie

Slide the wooden collar and leather tie straight up and off the carafe. Set them aside — they never touch water, just wipe them with a barely-damp cloth if they get dusty or pick up a coffee drip.

Step 2: Rinse out loose grounds immediately

Run warm water into the Chemex right after you finish pouring, swirling to dislodge any stray grounds stuck to the glass. This takes ten seconds and prevents half your stain problems before they start.

Step 3: Scrub with bottle brush and soap

Squirt dish soap inside, fill halfway with warm water, and work your bottle brush in circles along the bottom and up the sides. The spout needs attention too — coffee oils love to hide in that narrow channel where your brush barely fits.

Step 4: Rinse thoroughly under running water

Hold the Chemex under the tap and rotate it, letting water cascade down all the interior surfaces. Any soap residue left behind will make your next brew taste like bubbles — not the coffee kind.

Step 5: Deep-clean with denture tablets monthly

For stubborn stains, drop two denture tablets into the Chemex, fill with warm (not boiling) water, and let it sit for 30 minutes. We do this while washing breakfast dishes. The fizzing action lifts stains your brush couldn’t touch, and yes, it smells vaguely medicinal — open a window.

Step 6: Tackle mineral buildup with vinegar

If you have hard water and notice cloudy white deposits, fill the carafe halfway with equal parts white vinegar and water, let it sit 15 minutes, then scrub and rinse. This cuts through calcium like magic.

Step 7: Dry completely before reassembling

Shake out excess water and set the Chemex upside-down on a towel, or right-side-up in a dish rack where air can circulate. Once it’s bone-dry, slide the collar back on — moisture trapped under that wood will eventually stain or warp it.

Pro tips & common mistakes

We’ve learned the hard way that ice cubes plus coarse salt makes a decent scrub in a pinch (swirl it around like you’re making a margarita), but it’s loud and a little aggressive — save it for when you’re out of denture tablets. Never use abrasive scouring pads or steel wool; they’ll scratch the glass and create little grooves where stains settle permanently. If your bottle brush is shedding bristles into the carafe, it’s dead — replace it.

The wooden collar will darken over time, and that’s normal. If it ever cracks or the leather tie snaps, Chemex sells replacements for about fifteen dollars. We’ve had the same collar for three years, and it’s developed this nice patina that honestly makes it look more loved than neglected.

Related guides

Frequently asked questions

Can I put my Chemex in the dishwasher?

Only if you remove the wooden collar and leather tie first — and even then, we don’t recommend it. The high heat can cause thermal shock in the thin borosilicate glass, and dishwasher detergent is often too harsh, leaving a cloudy film. Hand-washing takes two minutes and keeps your Chemex happy for years.

How often should I deep-clean my Chemex?

Once a month is plenty for most people. If you brew dark roasts daily or have hard water, bump it up to every two weeks. You’ll know it’s time when the glass looks hazy even after regular washing, or when you hold it up to the light and see a rainbow oil film.

What causes brown stains inside my Chemex?

Coffee oils and tannins bond to glass over time, especially if the carafe sits with residue in it. Rinsing immediately after each brew prevents most staining. For existing stains, denture tablets or a baking soda paste (let it sit 20 minutes, then scrub) work wonders.

Will vinegar damage the glass or wood collar?

Vinegar is safe for the borosilicate glass, but keep it away from the wooden collar — it can dry out the wood and fade the finish. Always remove the collar before any deep-cleaning that involves soaking or acidic solutions.

My Chemex smells musty even after cleaning. What do I do?

That’s usually trapped moisture or old oils in the spout. Try the denture tablet soak, then rinse with boiling water (pour slowly to avoid thermal shock). Make sure you’re drying it completely upside-down after every wash. If the smell persists, it might be the wooden collar — wipe it with a cloth dampened with diluted vinegar, then let it air out for a day.

Can I use bleach to clean my Chemex?

We don’t recommend it. Bleach is overkill for coffee stains and leaves a smell that’s nearly impossible to rinse out completely. Denture tablets or a vinegar soak are just as effective and won’t make your next pot taste like a swimming pool.