When my notebook-keyboard was flooded with beer, i dismounted it and cleaned it under flowing water (hand-warm) for some minutes, then i dryed it with a hairdryer with enough distance to not overheat it for alt least 10 -15 minutes. It works again for half a year now without problems.
The only problem with a mouse could be water in the switches, where it won't dry out. You could try to use air-pressure for them...
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cheers, Thomas
new owner of the MK1 00123
MK2 12GB 090000815 (my first one)
MK2a 040103735 (from 303) and ???