If the scratches haven't gone below the plastic coating, you might want to try some Magic Merlin or something, that's what we have here in Canada. It's basically a silicon liquid that solidifies when heated, so you pour this white goop over the scratches and then rub like a madman until they're gone. Worked for my Gears disc back in the day when I was stupid enough to move the console while it was on. Look around in your closest EB, if you've got one near you - they usually stock it in the back.
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