Get it as apart as possible (take photos to help put it back together correctly!).
Circuit boards can be rinsed first with distilled water, then with alcohol (ideally 99% pure ispropyl, which might be available at the drug store). Don't use a heat gun to dry it off; the alcohol should displace almost all the water. A fan blowing air across the parts for a couple days should do it.
I would skip the water and go straight to the alcohol. Most circuit boards these days are made with what is called "no-clean" flux. Meaning that the acids in the flux sublimate under soldering heat and become inactive so it doesn't get cleaned off. Sort of like the old rosin flux. When hydrocarbon solvents were banned by the Montreal protocol, industrial use of mildly activated rosin fluxes (RMA) died and water cleanable organic acid fluxes predominated. As no-clean chemistry progressed getting rid of the cleaning step and all the attendant Eco issues became more common. The problem is that with most no-clean fluxes putting them in water creates a white sticky mess all over the place.
What you are worried about is the sugars in the drink creating conductive pathways. So rinsing it off becomes paramount. They can also mobilize acids in the original flux leading to conductive paths and problems down the road.
Rinse with alcohol (IPA, isopropyl not the beer), wet it down again and blot the solvent up with something like a clean non-shedding tissue (Kymwipes are the industrial standard) which will lift contaminants off the boards. Unless you can actually run enough IPA across the board to flush contaminates away, wetting things down and scrubbing with brushes only loosens them and moves them around. Blotting is the best way to remove them.
