How to Clean a Cold Brew Maker (Mesh, Felt and Jar Filters)
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Cold brew sits in your maker for 12 to 24 hours, and the grounds stay wet long after you pour the last glass. That makes a cold brew maker one of the easiest coffee tools to neglect and one of the quickest to turn sour or moldy. Learning how to clean a cold brew maker properly comes down to one question: what kind of filter does it use? Fine mesh filters need soap to remove coffee oils. Felt filters should never see soap. Paper and cloth filters are disposable or need their own care.
Here is a step-by-step routine for each type, a weekly deep clean and a troubleshooting guide for stains, smells and mold.
Key takeaways
- Empty and rinse the maker as soon as the brew is done; wet grounds left for days invite mold.
- Mesh filters: gentle sponge and oil-cutting dish soap, then dry completely.
- Felt filters: water only, no soap, stored damp in a sealed bag in the freezer, and replaced regularly.
- Never store a filter wet inside a closed pitcher.
- Always check your maker’s manual for dishwasher and filter instructions.
In this article
- Know your filter type
- How to clean a cold brew maker after each batch
- Weekly deep clean
- Troubleshooting stains, smells and mold
- FAQ
Know your filter type
Most home cold brew makers fall into one of four groups. If you are not sure which one you own, our guide to cold brew maker types shows how they work.
| Type | Filter | Soap on the filter? | Key risk |
|---|---|---|---|
| Pitcher with mesh insert | Fine stainless or plastic mesh | Yes, mild dish soap | Oil buildup, clogged mesh |
| Immersion system with felt filter (Toddy-style) | Thick reusable felt pad | No, water only | Mold if stored wet at room temperature |
| Mason jar with mesh basket | Mesh cylinder | Yes, mild dish soap | Grounds trapped under the lid seal |
| Bag or paper filter systems | Paper bags or cloth bags | Paper: discard; cloth: see maker’s instructions | Odor in cloth, tearing in paper |
How to clean a cold brew maker after each batch
The best cleaning habit is speed. As soon as the concentrate is decanted, deal with the grounds.
Step 1: Empty the grounds
Tip the spent grounds into the compost or trash, not down the sink: coffee grounds can build up in drains. Tap the filter over the bin to release as much as possible before rinsing.
Step 2: Clean the filter by type
Mesh filters (pitchers and jars). Blue Bottle Coffee’s guidance for the Hario cold brew pitcher filter is a good model for most mesh filters:
- Clean the filter after every use.
- Use a soft sponge, ideally without a rough scouring side, with water and an oil-cutting dish soap.
- Wipe the mesh gently inside and out. Let the soap do the work; pressing hard can damage fine mesh.
- Rinse well and let it air dry completely.
- Store it in the pitcher only when both the pitcher and filter are fully dry. Storing it wet and enclosed can cause mold.
Felt filters (Toddy-style systems). The Toddy brewing guide gives clear rules:
- Rinse the filter under running water only. No soap: felt absorbs it and your next batch would taste of detergent.
- Immediately put the damp filter in a resealable plastic bag and store it in the freezer until the next brew.
- Replace the felt filter after up to 10 uses or 3 months, whichever comes first.
- Paper filter bags used with the same system are single-use.
Step 3: Wash the container and lid
Wash the brewing container, lid and any stopper in warm, soapy water, paying attention to threads and silicone seals where coffee residue hides. Many makers say parts are dishwasher safe, but Toddy, for example, recommends hand-washing for the longest life. If your maker has a rubber stopper, reinsert it gently; pressing too hard can crack the container.
Step 4: Dry before storing
Air dry everything upside down with lids off. Trapped moisture plus coffee residue is what produces musty smells.
Weekly deep clean
If you brew several batches a week, give the maker a deeper clean every week or two.
- Soak: fill the container with hot water and a few drops of dish soap. Soak the lid and any mesh insert for 15 to 20 minutes.
- Scrub stains: make a paste of baking soda and a little water and rub it onto brown stains on glass or plastic with a soft brush.
- Clear the mesh: hold the mesh filter up to the light. If you see blocked patches, soak it again and brush very gently with a soft toothbrush.
- Check the seals: remove silicone gaskets if your model allows it, wash them and dry them separately.
- Rinse and dry thoroughly before reassembling.
For felt filters, a deep clean is not the answer. If a felt filter smells sour or shows dark spots, replace it.
Troubleshooting stains, smells and mold
| Problem | Likely cause | Fix |
|---|---|---|
| Brown film on the container | Coffee oils | Hot soapy soak, then baking soda paste |
| Brew drains very slowly | Clogged mesh or old felt filter | Deep clean the mesh; replace the felt filter |
| Sour or musty smell | Filter stored wet, grounds left too long | Deep clean; dry fully; freeze felt filters between uses |
| Fuzzy spots on a felt filter | Mold | Throw the filter away and use a new one |
| Fuzzy spots on plastic or glass | Mold from moisture | Wash thoroughly in hot soapy water and dry fully; replace parts with cracks or scratches you cannot clean |
| Soapy taste in coffee | Soap left in mesh or used on felt | Rinse mesh thoroughly; replace a felt filter that was washed with soap |
| Bitter or stale flavor | Old oils or stale coffee | Deep clean, then brew with fresh coffee |
A clean maker only helps if the cold brew itself is fresh. Our guide on how long cold brew lasts explains storage times for the finished concentrate.
Quick cleaning checklist
- After every batch: empty grounds, clean the filter for its type, wash the container, air dry.
- Felt filters: water only, bag, freeze; replace after 10 uses or 3 months.
- Every 1 to 2 weeks: soak and deep clean containers, lids and mesh.
- Never: soap on felt, wet filters in a closed pitcher, grounds left in the maker for days.
Coffee that makes cleaning easier
Grind size matters for cleaning as much as for flavor. Fine grounds slip through mesh, cloud the concentrate and clog filters. Our Cold Brew Coffee is a dark French roast ground very coarse specifically for cold brew, so it filters cleanly and leaves less sludge behind. You can also order any of our best sellers in the Coarse grind, which suits cold brew and French press. Our guide on how to make cold brew covers ratios and steep times.
Cold brew maker cleaning FAQ
Can I put my cold brew maker in the dishwasher?
Check the manual. Many containers and lids are dishwasher safe, but some brands recommend hand-washing for longer life, and felt filters should never go in the dishwasher.
Can I use soap on a cold brew filter?
On mesh filters, yes: a mild, oil-cutting dish soap removes coffee oils. On felt filters, no: rinse with water only.
How often should I replace a felt cold brew filter?
Toddy recommends replacing its felt filter after up to 10 uses or 3 months, whichever comes first.
Why does my cold brew maker smell musty?
Usually because the filter or container was stored damp, or grounds were left inside too long. Deep clean, dry everything fully and freeze felt filters between uses.
Sources
- How do I clean my Hario Cold Brew Pitcher filter? Blue Bottle Coffee support. support.bluebottlecoffee.com
- Toddy Cold Brew System brewing guide (PDF). webstaurantstore.com
Facts checked in October 2026.
Keep reading: Cold Brew Maker Types · How to Clean a French Press · Best Selling