The wing blew over a vat of vinegar where I had
been soaking rusted files.
Now the concrete patio has a rust stain.
What is best way to remove it?
Also: The files still look rusty. Should I clean again
and oil them? Or...?
Oxalic acid removes rust. It's toxic. ZUD, sold in supermarkets, is a
relatively safe form. Wood bleach is a stronger form.
Muriatic acid removes worse stains by dissolving concrete. It requires
The difference between a rusty knife and a rusty file is that you can
sharpen a rusty knife.
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