How to Clean a CHEMEX Coffeemaker Without Damaging the Collar

Step-by-step instructions

Step 1: Cool, empty, and inspect the glass

Let the vessel cool before washing. Lift out the used paper filter and grounds, then empty the remaining coffee. Work over a clear sink rather than between stacked dishes: the narrow waist and projecting spout need room. Look for a chipped lip, cracked base, or impact damage before putting a hand or brush near the opening. Cleaning cannot repair damaged glass. Avoid turning a hot carafe straight into a cold rinse simply because the outside feels comfortable near the wooden handle.

Step 2: Remove the collar and leather tie

For a wood-collar CHEMEX, untie the leather and lift the two wooden pieces away from the waist. Set them somewhere dry and separate from the washing area. Photograph the arrangement first if you are unfamiliar with retying it. A glass-handle model has no wooden collar to remove, but the handle still needs protection against knocks. Do not soak the collar with the carafe or put the leather tie in a dishwasher. If the wood needs attention, use a restrained surface wipe and let it dry.

Step 3: Wash the bowl with warm, soapy water

Add warm water and a modest amount of dish soap to the glass. Swirl gently so the solution reaches the coffee ring, lower bowl, neck, and pouring channel. CHEMEX recommends this simple hand-washing method with a coffeemaker brush. More detergent is not automatically more effective; it can simply make the narrow vessel harder to rinse. Keep a secure grip on the glass while it is slippery, and rest it on a protected surface whenever you need to change tools.

Step 4: Reach the coffee film with a soft brush

Use a soft brush designed to enter the opening comfortably. Work around the bottom and curved sides rather than driving a rigid handle against the glass. Give oily deposits additional contact with the warm wash water, then brush again gently. Do not pack a cloth inside so tightly that retrieving it requires force. A brown surface film is a cleaning problem; an obvious crack is not. Avoid steel wool, abrasive powders, or scraping with cutlery to chase the last mark.

Step 5: Choose the dishwasher only for the permitted glass

The official FAQ permits dishwasher cleaning after the wooden collar and rawhide tie have been removed. Position the glass securely so it cannot strike neighboring items during the cycle. That permission applies to the glass coffeemaker, not every accessory or electric brewer component bearing the CHEMEX name. Hand washing gives you better control if the rack cannot hold your particular size safely. Do not wedge the neck onto a rack tine that puts stress on it or crowds the pouring spout.

Step 6: Rinse thoroughly and let the inside dry

Rinse until no foam or slippery soap film remains, turning the vessel so fresh water travels across the neck and lower bowl. Inspect it against a light background for leftover coffee streaks. Drain it in a stable position with airflow into the opening; do not balance it precariously upside down. A clean exterior towel can remove drips without being forced through the narrow waist. Allow the glass and collar to dry before reassembly, especially where the wood will contact the waist.

Step 7: Reassemble and separate cleaning from brew troubleshooting

Fit the wooden pieces back around the dry waist and retie the leather securely, checking the handle before lifting a full carafe. If the next brew still drains slowly, do not automatically repeat aggressive cleaning. CHEMEX also identifies grind size and filter placement as brewing variables: grounds that are too fine or a filter blocking the air channel can affect flow. Keep the three-layer side of the appropriate folded filter toward the spout, as directed by the brewer instructions, and adjust one variable at a time.