Review on USA-Made Universal Descaling Solution (2 Pack, 2 Uses Per Bottle) for Keurig, Nespresso, Delonghi, and All Single-Use Coffee & Espresso Machines by Christopher Shah

Works like a charm! I actually followed the instructions both on the bottle and in the DeLonghi Nespresso Vertuo and Keurig K-Elite manuals. I mixed up half a bottle (4 ounces) for each machine and filled the rest of each tank with water. On the Nespresso, I activated descaling mode by holding down the main button and pressing the lever for at least 3 seconds and letting it run to the end. Then I started the rinsing cycle of two tanks with clean water. This process was pretty quick as the Nespresso tank is small. The orange-green descaling indicator has disappeared after descaling. Of course, descaling the Keurig took much longer. Keurig doesn't have a "descale mode," so run hot water on the largest cup about 6 or 7 times. After all of the descaling solution has run through the machine, Keurig says to flush it out with two tanks of clean water, which works out to 12 starts. The entire descaling/rinsing process takes up to 45-60 minutes which is a huge hassle so luckily I only descale once every 1-2 years. My Nespresso and Keurig machines taste great and are like new. Much luck!