Lots of good advise and methods given, the main thing you need to do is use a water base cleaner to soften/remove the oxidation.
Solvent does not work well on dirt, mud, oxidation, rust etc.
Water does not do much on grease, oil, tar etc.
But just like washing your hands, warm up the water add a little soap and it does wonders.
My method uses an old 3 gallon pot on a hotplate outside the shop.
A gallon or so of water is usually enough to cover everything, to this I would add some of the old school rad flush.
Problem is the rad flush they make now is not like the old stuff that I finally ran out of it so I looked into what the active ingredient was in it.
Oxalic acid was the secret ingredient so I searched for a product that contains it.
Barkeepers friend contains oxalic acid and is easy to find so to the gallon of water I dump in a half a can of the stuff.
Let it come to a boil then check it every half hour or so until it looks good.
I have never destroyed any steel, aluminum, pot metal or brass though if left long enough I suppose anything is possible.
Once it looks good I remove it and put it into a solution of water and baking soda to neutralize any remaining acid then finally flush with clean water.
I once tried to dismantle a nasty looking old Marvel Schebler that had sat outside for 30 plus years.
After snapping the heads off a few screws I decided to boil it out for a while.
The rest of the screws came right out and the broken off remains of the damaged screws I was able to unscrew with my fingers.
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