That makes sense... when i have the time, i should go and try to clean it better. Because now when i'm thinking, i didn't actually got it "shine-like-brand-new" clean.
Maybe it wasn't enough... well, i try to clean it with more powerful CARB cleaner instead of BRAKE cleaner. If it doesn't work, i should try to borrow another IACV from another Primera.
Thanks again! I appreciated your answer very much