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I just use O2 Sensor safe carburetor cleaner, I was going to try Electrical parts cleaner when I run out.
 

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I use CRC MAF Cleaner. Definitely makes a difference if it's dirty.
 

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Is it possible that it can decrease mileage?

How do you know if it's dirty (i mean the inside of it... i know that dirty looks dirty...)
 

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Yes it can decrease mileage. You have to take the sensor out and look at the two sensor resistors. If they're dull grayish in color, they're dirty. If they're shiny silver, they're clean.
 

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I used CRS MAF cleaner. Didnt notice a dang thing, my car still stumbles and acts funky. On to stage 2 I guess (new plugs and wires)!
 

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I use electronics cleaner, and it made a HUGE difference the 1st time I did it.
It hadn't been cleaned the life of the car at that point though, 60k miles or so.
I do it every oil change, and every time I clean and re-oil my air filter.
 

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I have used MAF cleaner, Brake cleaner, Starting fluid, carb cleaner, rubbing alcohol, electric parts cleaner, electric motor cleaner.... they all do a great job.

And yes it can make a big difference.
 
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