I did a 996 TT cab the other day, and the guy told me before I even showed up at his place that he wanted to know the products I was using, NOT because he wanted to buy some for himself, but because he wanted to know if I was using quality products that he would allow on his car. I told him everything, and understandably, he watched me like a hawk as I detailed away. I wouldn't trust some guy detailing my 996 TT if I'd only done it myself before... As I applied a step, I pulled out what I was using, showed the guy what it was, and told him how I was going to apply it.
He liked the job I did so much, I got a $50.00 tip.
Also, How's that for a first customer? He liked it so much, he took a couple business cards and is gonna distribute them to all of his buddies with ferrarris and the like.