Verified answer

My suggestion is this...if they contacts look corroded then you can either try using a Q-tip that is slightly damp with rubbing alcohol and gently trying to clean them. If that doesn't work you can try (but I wouldn't recommend it) using the edge of a new eraser and gently rubbing the contacts.

The problem I see is that you were using the card when it got wet which means there was current being applied to it and it probably shorted out which would have scrambled the data on it.

If you have not already just let it sit in a cool, dry place for a few days, clean those contacts and hope for the best.

You need to get Silica Gel Packets to dry out your SD Card. Just place it in a bag of Silica Gel and the Silica Gel will dry it out completely, air drying will not get it fully dry. Silica Gel is one of most moisture absorbent materials available. Get you one of these pouches filled with packets of silica gel and just put your SD Cardinto it... good luck:

http://www.silicagelpackets.com/dry-packs-moisture...

let it dry out. If youve already done that, try using the card with multiple card readers.