While alcohols will help remove any organic deposits (oils) and if pure enough don't increase the risk of oxidation (like water), they will not remove any oxidation/corrosion. There are chemical means for that, but the safest way is with an eraser to rub it off; then wipe down with an alcohol. ACAtune maps the ROM and does some other good things, so I'd use it. If you have a clock-battery add on, set the date (with DATE) and save the correct time/date with SETCLOCK SAVE, then in your startup-sequence use SETCLOCK LOAD to set the date and time when you boot.
