There is nothing more frustrating than something needing a zipper fix when the clothing is still wearable. I hate doing zippers in clothing. TADA! Found a fairly inexpensive idea - better than throwing away and buying new.
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If you have a sticky zipper on a piece of clothing, try rubbing the zipper with a pencil. The graphite in the pencil should help lubricate the zipper. A bar of soap also can be effective.