The elbow (90) that is common to crack, wouldnt be in an area where you can see it. You have to follow it around with your hands to the back of the throttle body and feel for any cracks. Brake cleaner wouldnt do much if sprayed in that area considering its pretty well hidden. I would check it one more time. If you can... twist and pull on it to remove it from the back so you can visually inspect it. It just comes off, but since it hasnt been removed.. like any other hose, a good twist and a few pulls will take it off. It is a very tight area though, good luck.