What is the cleanest data in an organization?
Arguably the cleanest customer information in any organization is Accounts Receivable, or who owes us money.
It appears that the willingness to expend effort to clean and maintain data is directly related to the value that information ultimately provides. If there is difficulty in justifying cleaning and managing customer information then the alignment to the metrics and objectives that really matter to an organization isn't quite right. It might be time to go back and revisit the fundamental objectives.