Ah, don't let that get you down, it's worth a try at least. At least you can get some exposure to some computer history. Clean it with distilled water, not tap water, that way you won't have any conductive mineral deposits on the surface. Erasers are good for removing light to moderate corrosion, just clean out the shavings cause they're kinda messy. Also, if you don't know how to use a soldering iron, you might want to find an inexpensive one and play around with soldering stuff together (not in the computer) on the off chance that a socket is too corroded to be usable (and the chip is not, hopefully) and can be replaced. You may also look around for a conductive trace pen, it might help if you need to find out if repairing the traces (if any are damaged) will help (although soldering may then be necessary for best results). Just wait until the machine gets there before you start thinking/worrying about it.
PPC: PowerMac G4 800 DP QS, Bondi iMac G3 333MHz (Upgraded from 233MHz) -- 256MB, Performa 6100/66 -- 72MB RAM - hd now dead :(
68k: Macintosh LC II -- 12MB RAM
Older: Apple IIe Enhanced -- 128KB RAM, Newton eMate 300 w/memory enhancement -- 4MB RAM