These are commonly called engine degreasers. I recently bought a cheap one for the garage to clean up the hard to reach places in the partially disassembled 149. They do need a decent compressor, but they will spray pretty much any liquid, from soap to solvent. This one has a mixture adjustment but lacks the thumb shutoff for fluid that the expensive ones have.
They are great for where a pressure washer is just way too much. Put some hot degreaser in a bucket and you can do a very controlled clean up pretty quick.
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