No longer just for magazines and newspapers, subscriptions these days include meal delivery, diaper delivery, and yes even car washes.
Since having kids we have had a car wash subscription to a franchise called Mister Carwash. They have some of the nicest facilities and some locations will do a full service of vacuuming and wiping down the interior for an extra nominal fee.
This was particularly helpful when we had a toddler and a dog because...well, we had a toddler AND a dog. Our toddler loved the car wash and with a subscription we would go sometimes several times a day. I loved always having a clean car despite the two mess-bombs in the back. And on days that my toddler wanted to do something fun but we didn't have a lot of time to spare, the carwash was a fun treat.
Because you know what they say: Clean is calm. And calm in the car is always a good thing.