Many factors effect successful rehab of drowned electronics, but key among them are the extent of damage to the circuitry from shorting. Immediately remove the batteries and do not replace them until the unit is completely dry. The next issue is to avoid corrosion, which can also cause shorting among other problems. Drying quickly and thoroughly is the key here. With a soft absorbent towel, blot all the water you can from every compartment, nook and cranny. If you can open up the item without damaging it, do so. After you blot all you can, then let dry thoroughly, the quicker the better, so rather than just letting it drip dry, put it in front of a fan. You could use heated air also to carry moisture away quicker, but I would be careful to overheat the item, which could cause damage of another sort. If shorting caused damage before the power source was removed, you stand no chance of reviving the item no matter how well you dry it, but if it didn't and you dry it well, you will have a functioning unit when the battery is returned. Good luck!