Other than getting it dry, the problem you could have is the sugar left on the board. Sugar may have some tendency to absorb moisture out of the air and become conductive. I would rinse the board thoroughly with tap water. Then blow the water out from under chips and sockets with a vacuum cleaner set to blow. Water under and inside things takes forever to dry, so blowing out as much as possible is a good idea.
I would not be picky about de-ionized water. All you want to do is to dilute the ions to a harmeless density. In the real world, everything becomes coated with ionizable substances in a very short time.
I guess it might sound strange to put a circuit board in a dishwasher, but in factories where they make circuit boards, something like that is how they are cleaned of the solder flux after they are done with the soldering stage.
Then they are cooked dry. You'd burn your hands instantly if you touched one. I have seen people jumping around in pain when they didn't wait long enough for the boards to cool down before they picked one up and couldn't let go fast enough. In the factory where I used to work repairing circuit boards. sometimes the process was done improperly and the boards would come up with huge numbers of errors in the automated testers. Although the boards looked dry, if you unsoldered any chip there was a brown liquid (a corrosive detergent) left underneath the chips. You could get rid of the errors by blowing the liquid out from under the chips with an air hose. We'd send them back to the cleaning process after were sure that was the problem.
Just to give you an idea, these were not cheapo circuit boards where they used slap-dash manufacturing techniques; they went into computerized equipment that cost tens or hundreds of thousand of dollars.