You shouldn't need to clean a MAF sensor, they're self cleaning by running a current along the wires to "burn" off any crud.
However, should you want to clean out the entire housing, electrical contact cleaner is your best bet. Halfords sell it quite cheaply:http://www.halfords.com/webapp/wcs/store...tegoryId_255223
If you're having running issues get a diagnostic check. A faulty MAF will show up a P code - P0102, P0103.