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I prefer to remove my TB and clean it on a bench. I'm not a fan of cleaning a part and introducing that filth to the intake and engine. My old Saturn would always stick when closed, after I cleaned it it was completely smoothe. Didn't help mileage that I could notice but was more responsive to a small change in pedal position. The EGR on the other hand was so clogged that I could pull the valve and the vacuum leak was only enough to rev the engine up to 2500rpm. Tried to clean the passage but multiple chemicals and flexible poking sticks did nothing to help.
I still need to clean the TB on my Focus and have yet to even consider checking EGR functionality lol.
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-Mike
2007 Ford Focus ZX5 - 91k - SGII, pending upper and lower grill bocks - auto trans 
1987 Monte Carlo SS - 5.3/4L80E swap - 13.67 @ 106
2007 Ford Focus Estate - 230k - 33mpg - Retired 4/2018
1995 Saturn SL2 - 256K miles - 44mpg - Retired 9/2014
Cost to Operate Spreadsheet for "The New Focus"
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