I used to work at dealers and time is the key element to poor preparation. I spend nearly two days doing full job on mine. They don't allow for prep work and a clay bar is unheard of. They now use minimum wage 'valeters' and it's a quick fire process and from what I saw on that forecourt there is little or no training on the equipment and as a result they've caused damage to the cars.
Back then we had a 1hr slot to wash and prepare a car for customer handover. When Supagard and Diamondbrite was sold with a sale there was still the same hour time slot, so no extra for the time it took to prepare the surface and apply correctly.
With second hand forecourts that poor prep is even worse.
Detailing World has some great info
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