Coffee is mildy acidic so is only slightly corrosive (depends on how you brewed it). More worrysome might be the sugar you may have stirred in, that will turn sticky. If you can/dare, open the unit and clean as much of the affected areas with IPA (iso prop alcohol). The IPA will help drive out any water and dissolve grease. IPA is not conductive, use it liberally. Do let it evaporate before turning on the unit, this is not to avoid a short (again, it is not conductive) but to avoid a boiling spot i.e., an area under a chip or othe components that gets hot, boils the IPA and thereby stresses the solder joints and/or chip.
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