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Cleaning old locks

I have lots of old locks made out of steel, gold, iron, brass, copper and un knows how do I clean them with out damaging them.

Aron Randall
- Alpheratta, Georgia, USA
2005

You can use citric acid ⇦ on eBay or Amazon [affil link] solution(5%), or ammonium citrate solution(mixture of 5o gm citric acid /1 lit water+ some ammonia(25%), pH of solutions must be 3,5 for iron and steel, pH 9 for copper and its alloys, last solution can be used for gilt pieces,i n principle one solution for one metal). WD-40 ⇦ on eBay or Amazon [affil link] or Ballistol can be used too (works very slow).

Good luck!

Goran Budija
- Cerovski vrh Croatia
2005

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