Keurig Coffee Maker Descale. Do not use a paper cup. Keurig, of course, recommends using its descaling solution or liquid for best results, but we reckon that you could go for a more general descaler if you want to save some cash.
You simply have to mix a little bit of vinegar with water for preparing the descaling solution. Here are the steps for how to descale your keurig coffee machine. Keurig machine is an example of the best coffee maker available in the market.