While we aren't able to target every single citation a business has, our Audit & Cleanup packages focus on Top Directories that have the MOST influence on your local search presence.
When we started doing this work, we attempted to do "all" the cleanup and we soon realized that it's impossible. Many of the citations we find are going to be on sites that nobody manages. These sites likely bought or scraped a list of business data, populated a database, and put up a business listing website. Now the site is completely abandoned. There is no option to edit the listings and no response to emails. There is no way to change citations on sites like this.
The good news is that incorrect citations on these sites aren't going to hurt you. The sites are inactive and Google largely ignores them. They don't have a strong enough signal to mess with your NAP consistency and affect your listing with Google.