When should the MAF sensor be cleaned?

[attyallanlatras]

DIY the TB by using an old rug, tb cleaner and a toothbrush.
Change the air filter every year, I just vacuum mine and reuse it. Then change every other year.
Clean MAF sensor, maybe every year or two. It depends how often you drive the car or if you notice any change in fc and or idling.

Sorry noob here, what is FC?