Generally, auto detailers are not salespeople...or they wouldn't be good at detailing. With that being said, if you are looking to increase business, then a sort of marketing is the best route. Since detailing is so mis-understood (can't I just drive through the car wash), educating potential customers that are curious to begin with is an easy first step. But you want to make it as professional as the detailing work you do. Be careful not to produce or handout anything that's not classy, quality, and as visually pleasing as the finished product of your detail...or you're simply doing your work a dis-service.
A tri-fold handout would be nice for people wanting a quick look at services and pricing. Here's a very inexpensive place to order those...but the design work would be done by someone else:
www.gotprint.net
Another idea would be having something to show your best work (high quality pictures in a high-quality book). This would be something you keep at your shop, at your home, and/or in your car. This would be your showcase book. Here's where to get something like I'm talking about:
http://www.adoramapix.com/app/products/books#/homeContent
Just some ideas from a guy that works with marketing to customers every day. It doesn't matter what the product or service is...people look at everything the same way; and with high-class detailing, you want to talk about customized services, exclusive handling of their vehicle, personalized attention, prestige, and NOT price. You are giving a customer what they really want...sometimes they just need to see it, hear it, and understand it. Everyone goes through the car wash, and they wonder why it never looks like it did the day the car was new. You're showing them it doesn't have to be that way.
Just my 0.02
