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I believe it's also sold in pool supplies.
Use it full strength. Pour it into a plastic container and drop the parts into it. Neutralize it in water with ammonia or baking soda added. Use rubber gloves and eye protection. Regular surgical gloves will not be affected by the acid, and they let you handle the parts. Don't breathe the fumes.
Only leave the gun in long enough to remove the bluing! Check it often.
After rinse, flood parts with WD 40.
When finished, use a plastic funnel and pour it back in the original container for later use.
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