What is the best way to clean a Nel drip?

The Nel drip, or flannel filter, is a traditional Japanese brewing method prized for producing a rich, velvety mouthfeel that paper filters cannot replicate. However, because it is made of fabric, it requires a much more rigorous cleaning routine than paper or metal filters. If not maintained correctly, the oils trapped in the flannel will quickly turn rancid, leading to a sour, unpleasant taste in your coffee.

After every brew, remove the grounds and rinse the flannel thoroughly under hot, running water. Do not use soap, as the fabric will absorb the chemicals, and no amount of rinsing will fully remove the soapy taste. Once clean, the flannel must be kept moist. The best practice is to store it in a small container of fresh, clean water inside your refrigerator. This prevents the fabric from drying out, which can cause the fibers to become brittle and trap old oils more easily.

Periodically, you should perform a deep clean by boiling the flannel in a pot of plain water for 5–10 minutes. This process helps to break down the accumulated coffee oils that a simple rinse cannot remove. After boiling, rinse the filter again in cold water to cool it down before your next use. If you notice the flannel becoming stained or if the coffee starts to taste 'off' despite your best efforts, it is time to replace the fabric filter entirely.

In practice, the Nel drip is a commitment to maintenance, but the reward is a unique, heavy-bodied cup of coffee. If you find the maintenance too demanding, consider how often you brew; if you only use the Nel drip occasionally, you may find it difficult to keep the filter in good condition. For daily users, however, the routine becomes second nature. By keeping the flannel clean and stored properly, you ensure that your Nel drip continues to provide that signature, luxurious texture that makes this brewing method so special.