A: We recommend you clean the inner container periodically with Zojirushi's Inner Container Cleaner (CD-K03E) or citric acid every 1 to 3 months. You can purchase the cleaner from our online Zojirushi Parts & Accessories page
or by calling our Customer Service Department at 800-733-6270, M-F, 8:00 a.m. to 5:00 p.m. PST. Follow these instructions to clean with citric acid:
1. Put 1 package of citric acid CD-K03E in a cup and add warm water to dissolve. Pour it into the inner container and fill with water to the maximum water level line. The cleaner may also be substituted with 1/2 cup of lemon juice from concentrate. If using freshly squeezed lemon juice, please be sure to strain first, so the pulp does not get caught in the pump and damage the boiler.
2. Close the upper lid, insert the power plug and press and hold the REBOIL button for more than 3 seconds. This will activate the descaling mode.
3. Once cleaning completes, unplug the power plug, detach the upper lid and dispose water where indicated "EMPTY FROM HERE."
4. To remove the smell of citric acid, fill the inner container with water. Boil and dispense about a cup of hot water, allow to cool, then dispose the remaining water.