I recently used Zaino on my Z and did Dawn the car. The car was new and I think that using Dawn once, and only once, prior to the clay bar, etc. may be a nice way to completely strip it of any dealer applied sealants.
After the dawn wash, I used the clay bar, then washed it with car wash and then used a polish followed by two coats of wax. The results were great. In my mind, using the dawn once gives you a clean pallate to work with and allows you to seal the paint without having anything under your was coats.
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