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WillaimC
 
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Default Test Results was Salt and vinegar for rust removal

Muriatic acid of the sort used for concrete work removes rust
completely and in a fairly short order. I dropped some fine thread
rusty bolts in this acid and left it overnight and the threads screwed
into the correct size nut with no problem so the metal was not eaten
away. The only posssible downside is that the metal is turned to an
even light grey, possibly from very light etching