There are several ways to remove rust from metal, including:
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White vinegar: Submerge the item in white vinegar and let it sit overnight. Remove the item and scrape with a metal brush or steel wool.
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Baking soda: Dust the metal item with baking soda, making sure to cover all rusty areas. Leave the item for an hour or so, then scour with steel wool or a metal brush, removing the rust down to the metal. Rinse and towel dry.
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Fiber wheels: This is the quickest and easiest way to get rid of rust from metal objects. Wearing protective gear, use a rotary tool, such as a Dremel, and attach a Brown (coarse) EVE Fiber wheel Abrasive Buff wheel. Gently rub the abrasive across the metal, and the rust will disappear in a matter of seconds.
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Lemon juice and vinegar: Apply a mixture of lemon juice, vinegar, and salt to the rusted areas.
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Commercial rust remover: Using a commercial rust remover that contains oxalic acid is the fastest way to remove rust from metal. Most work within just a few minutes of application.
Each method has its pros and cons, and some are better suited for certain types of rust or metal objects than others.