How to remove frame rubbing residue on the glass from mis-handled stacking of panels?

How to remove frame rubbing residue on the glass from mis-handled stacking of panels?

Per the title. I've got a pretty significant marring on the glass of a particular panel - it's not a scratch, precisely - but it's rubbed off (aluminum?) from another panel being dragged across it during re-stacking in the warehouse.

I'm wondering 2 things:

(A) how best to remove that rubbing (I've found instructions to not use sodium hydroxide (lye) that could normally dissolve the aluminum (assuming it is aluminum)).

(B) what kind of math /power am I loosing on this if it gets installed? The rubbing is over a single cell, and i have no idea what kind of "shade" the mar will cause.

What do you guys know?

EDIT: also - any you guys ever put a meter on a panel that has that rubbing on it to see what we're really loosing?

submitted by /u/Rocksteady2R
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