I wouldn't use it. Though I am not a chemist, I have been in the cleaning and sanitation industry providing cleaning chemicals to the Institutional market place for 11 years. While CLR is good for removing calcium lime build up from hard water on your home shower head, bathroom faucets, and stubborn rust stains in the toilet or urinals, it contains phosphoric acid. This is reactive to metals and it will pit and etch the surface.
A safer route would be to use Kano Kroil penetrating oil. I've had great success using Kroil freeing up rusted bolts around the shop and cleaning rust off the exterior of Damascus barrels. Soak all the parts for a while and use a soft brush to clean off the junk. Get the Kroil in aerosol and you will never use PB blaster again.
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