Home Depot, Lowes, etc. Often used to etch concrete. Look in the cleaners/solvents/paints. Careful when using it as opposed to the milder removers. It is Hydrochloric acid. Also, rinse the heck out of your part when you are done, and oil it. Hydrochloric has a tendency to promote flash rusting. You might even bathe it in baking soda to neutralize it.
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