Try taking the camera apart and letting it air dry
Now for the kids, best thing to do is get a box that says "dont touch", and wire one of those large capacitors to it. Now when you tell them to dont touch or open it and they try, POW! A couple of times will make them not do it anymore.
Just like putting a penny in a lightsocket, do it few times and you know better. (its a true story, dont ask)