As I posted sometime ago, on my old pre-war trains I use a piece of Bounty paper towel and polish with cold cream. Takes time, is tedious but I have cleaned up several old Standard gauge cars. They don't look new, don't expect that, but have taken a lot of black dirt accumulated by poor storage. Part of the reason I bought them cheap-they were dirty. I am afraid of aerosol sprays and modern cleaners. I have tried most everything-toothpaste, liquid soaps, furniture polish, ad nauseum. If you damage the finish it is irreversible so be careful.
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