I always use Simple Green, and then hit it with my pressure washer. I have one that's electric, it comes on when you squeeze the handle and water starts to flow through it. It's not very high pressure, but it's about the same as a car wash. Oh, and when you spray the simple green on, let it sit for about 5 minutes before you start spraying. Always works great for me!
My dad had an attachment i used to clean my cars engine bay once. it was for hi air compressor, and basicallyran a tube to a bucket of water to create a fair spray. I used really hot water to assist the dirt and grime off.
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