use 1 part hydrochloric(muratic) acid to 2 parts distilled water. ALWAYS ADD ACID TO WATER, NEVER WATER TO ACID. Immerese for 5 min to 1 hour until you see a milky white residue on the part. This residue will wash off. You can speed it up by using a lead cathode and a dc power supply if you have access to that. Muratic can be found at home depot or lowes commonly called concrete cleaner. Acid can be nuetralized with baking soda if you spill any.
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