Never did that myself. but try this.
since it got wet anyway.. take out the battery and saok it in
distilled water. let it dry for a week or so. The distilled water will
remove any minerals that may have been  in the wash water. secondly
you need to let it dry for at least a week to get the water to
evapate. After you let it dry for a week. put the battery back in and
see if it works. if not... you tried! Forget taking it appart! Today's
circits are teeny! as are the screws! Best to get a used one on Ebay
if all else fails.