J,
depending on whether you can get all the screws back, I'd suggest opening the back and leaving it open for a while to dry out. also depends on whether it has a warranty which will be void if you open it.
I'd avoid direct heat.
water will eventually evaporate but can also re-condense in corners or tight spaces if not aired out. main concern would be water condensing on dense exposed tracks or smd chips on the MB. most pcb tracks are covered, exposed areas would be high density smd ic pins.
most hard disks do have a pinhole in them, so hard to say what could happen if it was completely immersed for a while.
if it was coffee, IPA is the best to remove sticky stains as it evaporates without residue.
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