First off, the rice trick does not work because it takes too long. Next time use a vacuum and try sucking the water out or use a can of Duster or an air compressor and blow the water out. You can still try blowing some air through and see if that helps but at this point you might just have to send it in to DJI, who knows they might cover it under warranty. Also this is the exact reason why I hand catch on landing every time. It is easy to do and if you take some precautions it is perfectly safe.
