Hubby's patience worked for me.
I was brought up in the cult from the age of 5. I always had doubts as a kid, but I knew I couldn't investigate anything for fear of being viewed as 'apostate' and disappointing my family and friends.
Later on I married a JW and we had children who had a close relationship with my parents, so I put my doubts to the back of my mind and just carried on with JW life.
When my husband dug around on the web to investigate his doubts, he didn't try to bombard me with all his findings, he simply asked the odd question which he knew would get me thinking.
After a few months of subtle comments and questions (eg. Is the 607 date correct? paedophile issues, UN membership, scientific inaccuracy of the Bible - all the usual stuff), I finally had the courage to sneakily do some research on the web.
I just looked at him one day and said, "You're right!" We then had a few anti-studies with our little girls and explained to them how we'd got it wrong. We just faded as a family.
Good luck to you, please keep trying, but don't be too confrontational.