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Most of what you want cleaned looks to be inside the engine compartment unless you just want to get under it. I don't think I would use a pressure washer unless it had a wide spray nozzle to keep from cutting into things. Spray degreaser on it first and let it sit a little while.

That radiator looks like it has been in for a while to rust that bad. It is the bottom bracket and not part of the core. Wire brush and paint it with Rustoleum or a rust paint of your choice. Clean your IP and then look for the leak source. Very hard to find a leak when it is that dirty.