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What is the best way to clean a Chemex?

Quick answer

The best way to clean a Chemex is to rinse it thoroughly with hot water after every use. For deeper cleaning, use a bottle brush with mild, unscented soap to remove coffee oils. Avoid abrasive scrubbers that can scratch the glass, and occasionally use a specialized coffee equipment cleaner to remove stubborn stains from the neck and base.

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The real story

The Chemex is as much a piece of art as it is a brewing device, but its iconic hourglass shape can make it notoriously difficult to clean. Because the neck is narrow and the base is wide, coffee oils and residue can easily accumulate in areas that are hard to reach. Regular maintenance is essential to ensure that your coffee doesn't pick up stale, rancid flavors from old oils.

After every brew, rinse the Chemex with hot water immediately. This prevents the oils from drying and hardening onto the glass. If you let the Chemex sit with old coffee residue, those oils will oxidize, which will negatively impact the flavor of your next brew. A quick rinse is the most effective way to keep your equipment in top shape.

For a deeper clean, use a long-handled bottle brush. This is the only way to reach the bottom of the carafe and the inner walls of the neck. Use a small amount of mild, unscented dish soap. Avoid harsh chemicals or heavily scented soaps, as the glass can retain these odors, which will then transfer to your coffee. Always rinse thoroughly until no soap bubbles remain.

If you notice stubborn brown stains—common in the neck area—you can use a specialized coffee equipment cleaner or a mixture of baking soda and water. Let it soak for a few minutes, then scrub gently with the bottle brush. Avoid using steel wool or abrasive sponges, as these will scratch the glass, creating micro-fissures where oils and bacteria can hide.

In practice, keeping your Chemex clean is a simple habit that pays off in the cup. A clean Chemex ensures that you are tasting the coffee, not the residue of yesterday's brew. By dedicating a few extra seconds to rinsing and using the right tools, you preserve the clarity and brightness that the Chemex is famous for, ensuring every cup is as clean and delicious as the first.

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