A while back I tried vinegar for cleaning a rusty trowel .can't say I was seeing much difference. I continued using it to scatter grit sand . Last week I took it out of the bucket ( I'd left it half in the sand bucket .
As in our science lessons .......... the conclusion is .top half just was bad rustwise .the lower half.... rust free! .
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Well ,it worked
But don't quote me that it will work for other things .I think it's trail and error!