After reading all the posts in the link you provide on your website do you still feel that using the water method you described is best? I have a '94 NA IV+. I've used Redline fuel system cleaner once, and I've used carb & choke cleaner a few times on the throttle bodies. I have no idea as to the condition of my intake/valves/heads/cylinders. My Z is running smoothly and I drive it spiritedly most of the time (redline is my friend).
thanks for having such a cool website. your two-tone doesn't bother me a bit. Enjoy!