Go to a 'GAME' shop, or a electronics repair shop you know. Let them have a look, dont do it youself, you could hurt yourself, or damage the DS even further. Good Luck
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It is classed as water damage, and probably needs to be replaced. A water damage specialist could fix the damage, but replacing it is probably a better choice.
Sharpeaustin: make sure that the battery is charged then turn on the ds using the switch on the right. Spearer: You have to mail it in to Nintendo for them to fix it, I think
Your DS was probably screwed. Try replacing it, or send it back to the store to fix it.
You can try buffing the scratches out, though you can always get a screen cover for your DS.
Blow on it 3 times.if that did not work then try taking the ds card out of your ds and put It under a tap!hope this helps :-)