Do both sticks at least work in the outer slot, if so, the ram may be OK.
One thing you might try;
Put some 91% alcohol in a spray bottle, maybe a pint or so . . .
Then spray wash the mobo, concentrating on the spill affected area, so the alcohol just drips off as you hold the board vertically.
Whatever residue may have been left by the water spill should be safely dissolved away.
Once all the alcohol seems to be gone, set the board in front of a fan for a day or so.
I've saved a few boards that had liquid damage that way, so I'd say it's worth a shot.