How many BG44K for Carbon Buildup

[zfarsh]

I have a toyota yaris sedan 2009 with 90,000 km on it. Dealer said i need Fuel Injection Flus (175$) and Trottle Body Service (50$), for loss of performance. I think i am down about 15 - 20 %, not sure as it is getting colder and heater on more than before. I found a place that has BG44K

The questions are as follows, and is directed to people who use BG44K only:
1) How many Cans should i buy, each is about 27$
2) What is the procedure you recommend on this specific case. Do i put the BG44K before or after adding fuel, and when do i re-add fuel (and if required, when do i add more BG44K).

I had made another thread, but it would be confusing, and I need this one to be specific to BG-44K only.

Thanks in advance.