Stop in for a cup of coffee

Anders, my Muriatic thread on FBBO. I think you'll enjoy it:

Restoring metal parts with Muriatic Acid.
I read your thread and the results are great! I suspect that the clams at the end were made up of some soft alloy that doesn't respond well to the treatment. A lot of speculation in the thread on the chemistry and I would reckon that good protective gear and excellent ventilation (i.e. being outdoor) are the most important things.

I have several chemical engineer friends that still know these things (most are far removed from the actual chemistry of their business nowadays) so I'll probably be able to get answers to any questions I might have.

I'm more intrigued by the electrolytic process, though and being an electronics engineer I might have some stuff at home I could use to create a high-current DC source. A couple of toroid transformers and some high-current diodes. I also think that the electrolytic process is more gentle on the part since it only affects the rust unlike all acid methods. Unless I'm misinformed.