| Trust me, washing the car first with it first makes claying much easier and better results. I use Zaino generally, but IMHO Ive used about 4 different clays and the only thing to seperate them is color. Lube is a different story, but many car soaps can actually be mixed in small ratios to make your own lube. Dont waste ~$5 a bottle on detail spray.
Dont do it in the hot sun or wind, as the lube dries to fast. Be careful of your ratio/water for lube, as it will make the clay very tacky and difficult to work with if wrong.

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