Lemon skillfully removes coffee dirt

After tasting a cup of mellow coffee, if you fail to rinse immediately, it will cause coffee dirt to adhere to the surface of the cup, which will affect the taste and flavor of the coffee. To clean the coffee dirt, soak the cup in lemon juice to remove it. If you can't get rid of the coffee dirt completely, you can use a neutral dishwashing agent, stick it on the sponge, wipe it gently, and then rinse it with clean water.