Pony restoration help

[WaterRaven]

This beautiful G1 Pony Bride recently came to me in a pony lot. She is perfect, except for this yellow stain and permanent marker residue on her backside:

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I soaked her in an oxiclean bath for half a day, scrubbed her, and tried nail polisher remover. Does anyone else have suggestions on how I might remove it or even reduce it?

Thank you so much!

[shadowlark]

I think your best bet would be to try to sunfade it off. Not sure it would help whatever the yellow is, but should get the pen off.

[lovesbabysquirmy]

Sunfading! 

[pinkkittywinks]

I think sun fading would help

Love pkw xxx

[WaterRaven]

Thanks so much guys! She's outside getting some rays! I used paper towel instead of foil, as some sites suggested, to cover her cute mark etc.