In New England, owners of the best car washes tend to pass them over to family members or sell to known colleagues in the industry (ex. a good competitor or a supplier who wants to be an operator). Few properties are advertised but sometimes washes are advertised in the industry press or local papers. Also, since the washes tend to be family owned, there are few franchise opportunities. So, those trying to break into the business, often must start a wash from the ground up. Start by viewing the infographic, "8 Must-Haves for Opening a New Car Wash".
Good sources of information: