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I've never gotten the drum grooves dirty enough to need to clean them....If they appear to have a significant amount of dirt in them maybe take a small piece of news paper margin where there is no ink wet it with isopropanol and press it into the grooves with a fingernail or toothpick and spin the drum. The drum rotor is typically grooved and the stator is typically mat finish to develop a thin cushion of air between metal and tape to help prevent tape stiction to the drum.
Are the copper wires you are referring to on the bottom of the drum stator where the drum bolts to the deck, or the bottom of the drum rotor (if so are they sticking out the gap between the stator and rotor or did you remove the rotor)?
If the first case those are probably slip ring contacts or the head output connections and there is no reason to disturb them.
If the latter something is probably damaged rather badly and a picture may be necessary to properly assess.
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