It might not actually be fried, the coffee residue may be causing a short that is preventing the drive from being detected.
Head to the drug store and get some Isopropyl Alcohol, aka Rubbing Alcohol. Make sure you get the 99% pure version - some may have additives that will leave a residue.
Then use a Q-tip dampened with the alcohol to remove the coffee residue. Use a small dish or shot glass to hold a small amount of alcohol, do not stick a used Q-tip into the bottle, or some of the crud it picked up will end up back in the bottle, contaminating the alcohol.
A small toothbrush can be useful for getting around component leads, use the Q-tip to get some alcohol on the residue then gently and slowly use the brush to drag any residue to an area you can clean up easily with a Q-tip. Brushing to fast will just splash the residue around.
When you get it as clean as you can, use some fresh alcohol and clean Q-tips to clean up any remaining residue, let it dry, and give it another try.
As far as removing the data, if you can't access the drive there is not much you can do short of physically damaging the platters, which I'm sure would void the warrenty. A very strong magnet might scramble the data, but we are talking industrial strength magnets, not the kind you'd find at home, even in a high powered speaker, and you'd have no way of knowing if you were successful.