Impurities in the soda (sugars, salt, etc...) can mess up both the electronics and the controls in an electronic device. Getting the impurities out of the unit is the problem. One solution I have used successfully with my cellphone (contaminated by sweat):
Remove the battery if possible (definitely turn the unit off!). Soak the unit in CLEAN (no soap or other additives), warm (not hot) water, swishing it around gently from time to time, for a couple of hours. If the water turns at all cloudy, replace it with clean water. Then let the unit dry completely before turning it back on. This may take several days, putting the unit in front of a dry air source such as a fan, shaking the unit gently from time to time (to move any water pockets around so they dry faster).
It worked on my phone, but my phone has no disk drive. If it's not working anyway, this may be worth a try. Good luck!
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