just recently did this on my gf's volvo, just go to your local autozone and get the maf sensor cleaner. basicly alls you do is disconnect the maf, take it completely off the car, put in on some newspaper, put it one side down on the paper and spray the screen and hotwire and then flip it and do the same.
with the maf cleaner you cant really spray ''too'' much as it desolves very quickly
i cleaned it like above 2 times just to make sure. you can let it dry for like 15mins in between sides. up to you