Buzzie,
You can set up the machine to prompt the customer with screens offering "deals" on wash packages. Personally I find them to be a little annoying, especially when many of the customers are older folks in my area, who have enough of a challenge purchasing the $8 wash from an unattended paystation!
Nonetheless you can offer discounts either on a debit funds (ie. create an account for $50 for the price of $40) or debit packages (ie. create an account for 5 washes for the price of 4). These are just examples and it all depends on how you set up the specials in the software. It also allows you to have "daily" specials which will pop up on the screen when the customer begins their purchase.
I tend to take a more passive approach with all of these options. I list our web address on the front of the Access unit, and mention savings of up to 20% if they buy a wash card online. It's not a huge percentage of my business, but the folks that take the time to visit the site and join the wash club make out very well and are "captured" customers going forward. We do offer, to current wash club members, the option of replenishing their account while at the access unit. It will prompt them if their balance gets below a certain predetermined amount.
These options come with a cost. I believe the Wash Access
Loyalty System (WALS) cost me $1K+ to set up for one site, and the club interface which ties my website into
PDQ's WALS system was ~$3-4K.
As I mentioned, once you purchase the WALS system, you have a wash club number which is how they tie all of your Access units together if you have multiple sites. The customer can purchase washes online or at the Access unit, and use them at your other sites. This was one of the reasons I chose to stick with the
PDQ Access unit when I expanded to multiple sites last year.
ScottV