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NASIOC, which is a Subaru Impreza/WRX board, gives instructions on using isopropyl alcohol and q-tip.

"For the MAF sensor, use a gentle cleaning action with 100% isopropyl alcohol and a Q-tip. This may be added to the 30K or 60K major service or a week or so after servicing your aftermarket oiled air filter to ensure a clean MAF sensor."

from: http://forums.nasioc.com/forums/showthread.php?t=995498
 
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