Your owners manual will tell you. If you no longer have it, look it up on line on the manufacturers website. I just run white vinegar through, then a few cycles of water to flush out the vinegar.
Every time I clean my mirrors, they end up having tons of streaks and almost look worse than before I started. What could I use to clean them that won't leave streaks...
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This is helpful. Broken down into 15 easy steps with pics to describe.
https://www.wikihow.com/Clean-a-Nespresso-Machine
https://www.youtube.com/watch?v=uLJWxLRGT8E
Your owners manual will tell you. If you no longer have it, look it up on line on the manufacturers website. I just run white vinegar through, then a few cycles of water to flush out the vinegar.
You need to descale it with a product like this: https://amzn.to/2HsTnn1