Thought I'd post this for anyone planning their first restoration/rebuild project.
Not quite the same technique as John Haigh at Rillington Place with his acid bath
This bath is for cleaning up old rusty, discoloured chrome. I use an old coffee jar for small parts with 3 teaspoons of oxalic acid then fill the jar about 2/3rds full with warm water. Chuck in your bits and give your bits a shake every few hours
Depending on the state of them they'll need to soak between 6 - 24hrs. Give them a good rinse and a polish after. For larger items like chainsets I use an old washing up bowl, about 3 tablespoons of oxalic acid and then half fill with warm water.
Probably best to use gloves and don't splash it around, its probably not very good for your eyes.
Here's some I made earlier
File comment: Before
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File comment: After
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Just search Ebay for Oxalic Acid