I have spent the winter trying all the home remedies on removing rust
from tools. Most of them worked well but left a black oxide film
which could be good or bad to others. I found using concentrated
lemon juice would remove the rust bring the metal back to a dull
metal color and if the rust wasn’t pitted bad the tools would look
new. I even had some taps that looked bad clean up and still be
sharp and can use them. Old bolts I had with nuts That wouldn’t turn
would turn again and with a little oil looks like new. Did some
Experimenting with the Brownpolymer to stop the rust, with good
results only when I had removed all traces of the rust. Not pulling
the part early. The part had to be rust free or it would reappear.
The polymer applied right would not transfer to any thing and
resisted wear great.
I presently trying powdered citric acid for making a for a better
term a pickling mixture of water and the powdered Citric acid for