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Without buying the descaling solution, learn how to clean a Keurig coffee maker with vinegar and lemon juice by following our easy step-by-step guide. Descaling is an important part of cleaning your Keurig® brewer. This process removes calcium deposits, or scale, that can build up inside a coffee maker over time. Calcium and scale are non-toxic, but left unattended, they can hinder your brewer's performance.