Almost universally, the answer is that it is impossible to remove the lines without destroying the glass in the process. With great effort, you might be able to remove the metallic side on the interior side of the glass, but the brownish lines that you see from the exterior are there to stay.
The only option is to buy a used rear glass window without defroster lines. Since nearly all 911 production cars were delivered with defroster glass since the late 60's, I've been told the only chance is to locate a rear window from a 912.
I abandoned my quest because I found that the '73 RS was delivered with defroster glass anyway, so I already have a semi-correct window. Only problem is I also have a third brake light which, obviously, the '73 did not have. That also is something that can't be removed from the glass.
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