Carbon Buildup = Fuel Injection Flush???

[zfarsh]

I have a Yaris 2009, automatic transmission, and i am at 90,000 km on it. Went for check-up (maintenance every 16k and it cost 120$ and includes oil change), and they tell me I need the following:

1) Brake Fluid Flush = 100 $ (ok I do have ABS, maybe i do need this???)

2 a) Fuel Injector Efi Flush = 175 $
2 b) Throttle Body Service = 50 $ (no idea what this means)

3) Air Filter change = 60$ (did it myself for 20 $)

There is carbon buildup, and toyota service is telling me i need to the the Fuel Injector Flush and the Throttle Body Service, all of which i have no idea what it is, and i dont see it in the service manual as a requirement. I have always been using cheap gas (87oct) and never tried any additatives, and always getting oil change by Toyota (ie no idea what kind of oil i am getting).

Pls guide me on what i should do. I am not mechanically inclined, but want to start learning being more independant.