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Get yourself a flap wheel and a drill motor, and try it on ONE DOT in an inconspicuous portion of the glass. You may have to polish it when you're done.
OTOH - if you never plan on using the sunroof as an air vent again, you can always remove it (and the weight of the mechanism, which is considerable) sell it for profit, and install a tin tray in it's place with epoxy sealant (under the roof line, not over it.) and then put your cells in there, with a piece of lexan over it.
I don't know if non-reversible is an option for you or not.
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"¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"
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