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[PCB Prototype] copper clad board oxidation removal

I'm new to PCB making for prototyping... I have some old copper clad stock, but its oxidized (salmon color on some and dull finish on others). waht's the best way of removing the oxidation? I ...
Ranking Name Answers
1 PCBWay Team 8
2 Engineer 1
3 Engineer 1
4 Dr. TRonik 1
5 John samathanam 1