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Block

I wouldn't wait too long to get it hot tanked. With environmental regs getting stricter all the time, machine shops are closing up rapidly. EPA costs are just getting too expensive and there just isn't the work to justify it any more.
 
If you want to DIY, and don't mind spending some time and getting dirty...

Take everything you can off the block, remove the galley plugs, any freeze plugs, get it as bare and accessible as possible.

Start by scraping off as much of the caked on, burned on gunk, paint, and rust as you can. Then put on the rubber gloves and safety glasses, start soaking everything with oven cleaner, including inside the oil gallies. Liquid drain cleaner works too. Then hit it with the pressure washer.

It will take many repeat applications, but eventually it will clean up.
 
The best way to clean up a nasty part, short of a hot tank, is some cheap oven cleaner. I've used the 'good stuff' and trhe dollar store stuff, and both seem to work about the same.

Coat it well with the oven cleaner, let it work for a little bit, and then hit it with the pressure washer. If you've got a Hotsy or other heated pressure washer, so much the better.
 
Look and you will see the inside of the block is painted to keep the cast sealed hot tanking will remove that coating soap and water will clean the inside good lots of stuff for the outside. A gallon of paint thinner will go a long way on the outside.
 
With EPA regs a lot of the hot tanks are going away. My local machine shop has a big oven that they bake parts in at high temp, works like a self cleaning oven. After baked just wash away the dust from grease, paint whatever.
 
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