I've seen people commenting on how they use a q-tip and rubbing alcohol.....I'd highly recommend AGAINST that....sure it might (keyword there is might ) work, but the odds of [censored] up your MAF sensor are higher than if you just did the right thing and used the electronics cleaner....
A lot of people will disagree with me here but if spraying the sensor down with cleaner does not get all the junk off and there's no alternative to having to actually touch the sensor elemetns then I would recommend using one of these. (see below pic) It's called an acid brush and it is made for just this type of thing. I work with electronic components and circuit boards all day long and it is what we use on very delicate parts.
Again, this would be done as a last resort before buying a new sensor.