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I just cleaned mine, two days ago. Well actually, I had to replace one as it threw codes multiple times. I replaced the exhaust solenoid, the lower one, and cleaned the intake one.
I used CRC mass air flow cleaner. My method was simple, start by removing the rubber o-rings on the base of the solenoid as you are likely to reduce their lifespan if you spray them with a cleaning solution. Next, a quick spray around the outside of the solenoid to wash off the surface oil, then I took the solenoid and stuck the small spray stick from the cleaner up into the end of the solenoid and flushed it out. Seemed to really push a lot of old oil and whatever else out from the solenoid body. I did this process until the fluid coming out was clean.
Car feels amazing again now that the CEL is turned off and the car is switching over at higher RPM.
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