What should I do if I see grounds in my coffee?
Grounds may have gathered in the exit or entrance needles and can be cleaned using a straightened paper clip or similar tool. Clean the exit needle of the K-Cup Pod Holder and the brewer entrance needles using the care instructions provided. For optimal enjoyment and to limit grounds in your cup, clean both needles and perform 2 cleansing brews, especially when transitioning from coffee pods to non-coffee pods like tea or cocoa.
From the official Keurig Coffee Maker Vinegar manual, page 6
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