Sometimes you can not really get rid of the graininess. I shot models in an old factory, lights, flash, everything. Still got a fine graininess. Which was fine as that worked with the imagery that I was creating. But yeah, I feel your pain on this. Sometimes it happens and you simply have to reshoot. You can tool around and kind of clear it up a little, but depending on how bad the grain is.... you may or may not be able to really compensate for it. Or at least that is from my experience.
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