Reviving Old Rulers

Old rulers with etched markings could be revived in a 3 simple steps:

1. Clean dirt and rust off with Scotchbright pad and WD40 or CLR calcium, lime, and rust remover.
2. Paint over the etched markings (enamel paint). Make sure to brush the paint in the etching.
3. Wipe off the excess with dampened rag, wrapped tightly around a flat block of wood.