I'd say by looking at your picture and the big spill mark across the pedal board that some liquid got inside and probably shorted something out. If cleaning it didn't work you may need to have it tested by a professional electronics repair man to find out if something was damaged when this happened. Whenever you spill liquid on electronics CUT POWER IMMEDIATLY and clean and dry thoughly (this means taking it all apart and cleaning and drying the inside too) before you put any power back though it again. Soda will eat circuitry with all the acid in it and leave a sugar residue. Beer or coffee isn't much better and will also leave a sugar residue all over the circuit board and electrical contact points of switches.

In fact you shouldn't have drinks anywhere near your gear because you are just asking for trouble. That may have been a $400 lesson learned the hard way.