I have never needed to use clay, so I have never used it. The following is Zaino;s recommendation. I imagine all clays are similar.
>>2. If you are looking for the ultimate paint surface preparation. Use Zaino Z-18 ClayBar first or skip to Step 3.
Zaino Z-18 ClayBar was designed to remove airborne contaminants, paint overspray, water spots, rail dust, industrial fallout, diesel fuel & catalytic converter residue and any other bonded surface contaminants from paint. All cars even brand new factory paint has airborne contaminants... Here's the deal. The non-abrasive Z-18 ClayBar will remove any surface contaminants from the paint finish and not hurt the clear-coat. The ClayBar will get that paint finish smooth as glass. Now remember waterspots, bird droppings and bug guts if left on the paint finish for any length of time. Will etch into the paint finish. The ClayBar will also remove any store bought waxes....
I recommend you use my car wash (Z-7) as a lubricant for the ClayBar. Just make sure to keep the surface area lubricated while using the ClayBar. Use 1/2 capful of Z-7 Car Wash to 12 ounces of water. I use a spray bottle for the mix. Shake it up and spray the area to be Clayed. Just make sure to keep the surface area lubricated while using the ClayBar.
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Good luck and keep us advised on your project.....