I had my ds ruined by stupid things my brothers did(not involving water), and now my ds card that was in it is unable to load on any of our dses. I've tried blowing, i've tried cleaning it. What else can I do to fix it?

Additional step but be careful! I found my kids were licking the game cartridges to get them to play in their two DS lites. Finally none would play. Cleaned the game cartridges with 80% alcohol dampened (not dripping) Q-Tips, gently wipe w/clean cloth, and allow to dry. Still none worked. Figured the game slot pin were coated in spit or oxidized. Took a cheap thin emery board for doing nails, used the fine side toward the pins and gently (going directly in and out so as not to bend the pins sideways) abraded the pins. Blow gently to remove any dust. Now both machines see all cards all the time.