Old license plates

Mark Poss

Well-known Member
I have several old license plates that are from the teens and twentys. They were hung in a barn for many years and are rusty. I would like to clean them up and possibly clear them. any suggestions how to clean the rust off without harming them?
 

Phosphoric acid like Ospho will clean up the rust like vinegar does but it will also turn the rust into inert iron phosphate which is black and pretty durable. I just noticed on a tractor today where probably ten years ago I treated some external grab handles and the coating is still strong and rust free.
 

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