Date registered: Jun 2008
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Mine wasn't so dirty. I took the body out and sprayed the sooty parts with a carb cleaner, and wiped with paper towel. A few minutes is all it took.
A side warning: when removing the body, there's a thin gasket. Mine broke into 5 pieces. If yours does the same thing, remember to FIND all pieces, or you'll end up with some in your intake manifold, and they might get sucked up into the engine.
Another thing: Get the real gasket, and don't use silicone or cork. There is negative pressure inside, so if you use silicone, it could deteriorate and get sucked in.
Oh, and one more thing. When I did this, the rubber connector was hard and shrunken. It didn't have a nice seal against the MAF sensor. So replace the connector to the MAF sensor if yours is hard.