Mass Air Flow Sensor & Throttle Body Cleaning

[Damian B]

I have a 2010 Yaris 3 door with 29,800 miles on it. I bought it into the dealership to have them check out a rough idle that I've been having and that on occasion it doesnt start if I let it sit for more than a few days. Their response was that I need to have my mass air flow sensor & throttle body cleaned out at a cost of over $100. I thought that seemed a bit odd to have the throttle body cleaned out with such low mileage and didnt think that the mass air flow sensor was something that could be cleaned. Does anyone know anything about this? Does that seem right???

Thanks
Damian B