GENTLY pull out any socketed chips including the CPU and document where each one went (and in what direction!), spray the board down with your favorite motherboard cleaner and let it soak for a while, rinse it under running water in the laundry sink, do that a few times until you're confident enough that agitating the corroded area with a fine bristle brush won't damage any fine-legged chips (not many on the SE/30), then give it another good hit with your cleaner and gently scrub the corroded area. Once clean, place the board on top of a box fan with the airflow blowing upwards until it's perfectly dry. Then do a full visual inspection and see how bad the damage is. Let us know what happens!
