Adverse effect of vinegar block cleaning on aluminum heads?

[James Phillips]

I learned on here to use vinegar to clean out rust inside of my 8ba block. It does work well. But I've become a little concerned about possible harm I may have done to my aluminum heads and water necks when I ran the vinegar through the block. The reason for this is recently immersed an accelerator shaft in vinegar to remove the rust. The part has an aluminum mount that bolts to the firewall made on the shaft and isn't made so I could remove it from the shaft. When I removed the part from the vinegar the rust was cleaned of the steel shaft but I noticed the vinegar had etched into the aluminum mount. Not really bad but very noticeable. Now I'm wondering if I may have harmed my aluminum heads