The person who owned, maintained or used this computer on a daily basis should have their Computer Card revoked. I have worked on a lot of machines and seen some pretty dirty and dusty ones but this is just mind blowing.
I can only assume it was in an industrial area and therefore exposed to a lot of dirt. Can you imagine the temperature this machine might have been running at?
It did clean up nicely though but I would have loved to see it boot up after getting rid of all the dirt.