Let me answer your thread-starter's question
by quoting Michael Stoops of Meguiar's.
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"Clay then polish---and here's why":
"Claying removes bonded, above surface
contaminants, and will make your paint
feel smooth as new glass."
"And you want to get all that above surface
bonded junk off, and out of your way, before
you can start polishing---otherwise known as:
removing below surface defects."
"Sounds logical, huh?"
~Michael Stoops
Senior Global Product & Training Specialist | Meguiar's Inc.
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Bob