Well "decking" the head would require precise machine work. You will need to remove the head if you want to re-surface the bottom portion of the cylinder head. Using a scrub or scotch brite pad will not do anything to the head except scar it and cause possible problems. Most people resurface heads when the motor has overheated extensively and resulted in an "un-even" warp, I would just remove the head and take it to the machine shop. Do not deck the head to much becuase it will yield a different compression ratio.
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