sounds like clicking rear axles to me to. Does the sound come from the rear of the car. If yes then I would recommend getting it double checked by a Nissan dealership then follow option a) on Ebized's post.
R222 is excellent stuff. It used to be called p21s. You get a lovely deep shine with it. Apparently the life isn't great with this wax and only last 6 weeks. I applied it once a month so no problem.