Reply To: How to remove 100 year old ink and some other "stuff"?
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Oxalic acid is actually quite effective for derusting tools in some forms and in cleaning products.
There is a powder scrubbing cleanser in the US called Bar Keepers Friend that has oxalic acid as the active ingredient. I use it as the final step after an acid derusting baths to get the grey film off.
It cleans iron and steel, stainless, and is particularly good on chromed objects, nickel plated objects, copper, and brass.
It’s my go-to product for Brass adjusters on planes and for Brass saw nuts, and as the final cleaning on the saw plates. Scrub the plates with crumpled up aluminum foil and the cleanser.
A similar product is called Zud. I think it’s a bit coarser and maybe has more acid. Maybe there is something like it in Euroland.
And some people swear by it for chrome plated things.
Good luck.
- This reply was modified 7 years, 7 months ago by Larry Geib.