[KevinC]

To the OP: For the fat $$ they charged, did the dealer even provide you with any documentation from the ceramic manufacturer? If so, as they should have, then simply follow their recommendation. If NOT - huge red flag. I'd then be willing to bet that the lot boy who did the PDI wiped on some stuff out of a bottle that says "ceramic" somewhere on it (what automotive detailing product doesn't nowadays?) and called it a day.