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Lay 1 bunch of celery sideways on a cutting board. Use a sharp kitchen knife to carefully cut off the top leafy parts and the white base that connects the stalks at the bottom.  A bunch of celery typically contains about 8-9 individual celery stalks. Advocates of celery juice suggest drinking a glass of it in the morning on an empty stomach, although there is no research that shows this is any better than consuming it at any other time of the day. Hold a stalk of celery under a running tap and gently rub your fingers along it to remove dirt and any other substances. Repeat this for each stalk to clean them all. You can also put the stalks in a colander, if you have one that is big enough, and rinse them all at once.
Cut off the top leaves and the base from 1 bunch of celery. Rinse each stalk of celery separately to thoroughly clean them.