I just ran across this short useful video from Scotty Kilmer. He shows a cool way to clean out both the EGR valve, and the connecting passages. While this is not a method of economy enhancement, it's a cool tip on maintaining the EGR system, especially of the ECM has set a code for insufficient EGR flow.
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I've seen this before, but I still wonder why he didn't shoot some carb cleaner into the carboned up feed to the manifold he drilled out and the supply side from the exhaust pipe. (you'd have to be careful with your choice of solvent on the latter, or you could possibly damage the o2 sensor and maybe the upstream Catalytic converter. My preferred brand SAYS it's safe for sensors, but...)
the WD40 is something most people wouldn't think of on the valve itself either...
and I wish the valves were all as easy as that one to access...