Maybe this will help anyone as clumsy as I was - While brushing my teeth I knocked my Dexcom receiver into the toilet. I snatched it out and wiped it off as quickly as possible. I continued to operate for a few hours, but over the course of the day, the display went blank. I was pretty bummed.
A quick check on the web told me you could put soaked electronics in uncooked rice. The rice draws the moisture out of the device. I stuck my receiver in a tupperware container of dry rice, snapped on the lid, and waited.
In about 24 hours the screen could be read. I rebooted (you know about rebooting your receiver, right?) and everything worked. I reset time and date, and all was good!