Sell it to them as a value-added service. I have had tremendous success with a local country club. They love me and treat me like a celebrity there. One member took me out to lunch and has been a monthly maintenance client for quite some time. When we are @ the club, many people stop and say thank you for such dedication to service (we've been there for three years) My pitch to them was we would work there every tournament and that they would receive a cut of the income. They said 'don't give us anything, just fair pricing.' So I came up with an ala carte list of express service options to offer on site and created a 'member's only' page for them on my website which gave the club a 10% discount on all services. The club's directors always ask if we're staying busy when we're there and WE DO! Anywhere from 5-8 cars per visit. One director commented that we are the longest running affiliate they've ever had. You don't need luck, you need a good approach-PM me with your email and I'll send you what I used to pitch them.
WIW mentioned sound. We have to run an electric generator while there and we service cars right near hole 9, one day a director and I took a walk from where we work to hole 9...half way there the sound of the generator was hardly noticeabl (about 20 yards away).