molasses (say a cup) in a bucket of water also works well, if slow ( think a
week or two...) and tends to be smelly.....

Leaves the cast completely clean back to grey, after a brush up. Will rust
again though...

russ

"DoN. Nichols" wrote in message
...
In article , mikee
wrote:
Thanks, Jim. I was hoping someone had actually tried it. I've got a
relatively expensive casting I want to derust, and it was either the
vinegar solution or beadblasting to remove the stuff.

Or -- electrolytic rust removal.

Enjoy,
DoN.

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