How do I clean up these coins

[Pa Neal]

They were deep but they are in bad shape

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[GB1]

they look like old copper coins no idea how to clean them

 

[sutphin]

CAREFULLY

 

[Ender_boy24]

well i find that soaking coins in coca cola would be good for cleaning copper coins yet i'm not sure if this does any lasting damage. If you wan't to soak it in coca cola for about 15 minutes then take out a rinse under water.

 

[Icewing]

Electrolysis with a modified phone charger.

 

[bradyboy]

I would first try to identify what they are -
Often times, cleaning found coins is a bad thing