With my wife, I know I can't attack the Bible directly. I think living in the South, being raised in the truth by uberdubs, and around non-JWs that hold a high regard for the Bible means that it is easier to point out how the WT bends the scriptures to support their doctrine. I haven't even started my fade (even though she knows I have doubts) because it would hinder my ability to study with her and her keep an open mind.
One thing I have noticed is how someone is more open to questioning their beliefs if they slow down their activity. Now I see why the WTBS pushes so hard for everyone to keep busy, to "stay in the center of JHs org", etc. I have seen how my wife went from expressing some of her own doubt back to complacent after spending extra time out in service. Even I (even though I'm fully awake) feel a sense of satisfaction if I go out in service. I think it comes from the years of being told that this is what we should do and spending time with the only "friends" I have.