I was trying to get an idea on how to approach a dealership that already has their vehicles detailed by an outside source. I go to church with the owner of the dealership. I was trying to get an idea on how much to charge.
Talk to him casually in church. When I was trying to get the dealerships I always went in with the attitude of "try it before you buy it" I offered the first one free. If they liked it they could continue with me if they didn't then no harm no foul.
And don't expect a lot for dealer cars. They usually don't pay much compared to your normal clients. the upside is they send you volume. So instead of one customer every 6 months that pays top dollar you get a few a week at a discounted rate.
+1 on that Bob... dealers don't care (not most of them, but I'm lucky with the Ferrari dealer I work with here ) about "how much better you do it", for them it's all about the $$. You'll have to be priced, just a bit lower than the "other guy" but you'll also have to blow his work out of the water in order to gain their business. Just don't sell yourself short and give him "showroom" details at "dealer" prices, because then you'll be hurting yourself. You'll need to gather some information about your competition before you approach them though... I'm sure you can find a few more selling points other than just the price... maybe time, maybe some free-bee's (better than discounts as you don't pay as much for them), maybe this or that. Good luck!