I had the exact same problem with my machine making 1 cup at a time.
Here is the solution:
1. make solution of 1 part vinegar & 2 parts water.
2. pour solution into resivoir and set for 2 hours
3. run solution through machine (yes, you will have to stand there and keep pushing the buttons).
4. take same solution (now very hot) and run it through machine 5 or 6 times
5. make fresh solution and continue process until machine runs full cycle.
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