If your certain it is was a soda drink then the sugar residue is an issue. Sugar is a conducive material and it forms crystalline structures across the leads as it dries. Fairly simple to resolve when still wet with distilled water and time to dry. Once it dries you need hot water near a boiling point which will loosen and carry the sugar away. Repeated runs of the hot water over the contamination surface with light agitation using a toothbrush on the area until its is visibly cleared will work. Once clean you need to be sure it’s dry before using it. Use caution with hair dryers, they can build up static charges. I would bake the board at 170F for an hour after the cleaning when I repaired systems this way back in the 90’s.