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Agreed clean before you lap.The copper contamination won't help your lapping job.Your lapping grit will embed in the copper attached to the bore.Sounds like a wreck to me.
I suggest choosing one of the better copper solvents and using it.
BoreTec Eliminator is one option. Its NOT recommended to allow multiple products to come together in your bore. Etching/damage can result.
This would include home brew "add some ammonia" ideas. That might work,but it might bring regret.
I have not used the electrolysis method but its one way that should be very effective.
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