Pour a little dilute hydrochloric or sulfuric acid solution into the flask.
The acid will react with the zinc to form either zinc chloride or zinc
sulfate, depending on the acid used, and both of those are soluble
in water. Hydrogen will be liberated so you will see the fizzing as it
bubbles off. When the zinc is all reacted, pour out the solution and
rinse the flask with water. Behold, clean flask!
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