Putting the cups/drivers and cable (minus the headband) into a bag of rice could have helped. The rice acts as a desiccant and draws the water out. Or of course you can always use desiccant, if you have access to decent amounts of it, but rice is pretty commonly available. I used this method on a couple of small electronic devices that got a dunking, with good results.
Sort of on topic: My friend used to have a job repairing pagers, and he kept latex exam gloves handy for the beepers that were labeled with the note, "Got Wet". He said he estimated most of those had been dropped in a toilet, thus the gloves for the repair work.