If you start using zaino for him, and he's possibly using a scratchy/swirly mit etc. they will be amplified when he washes with that bright "Z" shine. Superbuick's right, sometimes people think "Z" is the magic cure for everything... Vettes do attract dust like mad(especially the rear end) because of the dual exhaust underneath. This is why alot of them prefer sealents because they don't detail as much and want their cars to stay looking good. You should also talk to him about AIO/SG if you don't have zaino. I saw your pics in the click and brag, and they looked GRT. I'm betting after a long drive, the dust accumulated like mad and then he went to wash etc... I clean mines every week so it's not a problem for me to still use wax on my vette, but I can see where alot of others don't have the time to do it often-hence why he's probably paying you to do it. Don't sweat it. Like Scott says, different product combos for different situations. I bet the other car you detailed for him holds up with that combo well, because it doesn't attract nearly as much dust as the vette...:xyxthumbs