Manually deleting guest customers in nopCommerce

nopCommerce creates a guest customer for each store visitor.  A scheduled task is then run by the store to clean up guest customers that did not complete the registration process, being updated to a registered customer.

In cases where the scheduled task has failed to run, potentially causing the customer table in the database to grow exponentially, the guest customers can be manually deleted through the Maintenance page of the store's administration section.  After logging in as the store's admin user, found at

Administration > System > Maintenance > "Deleting guest customers" pane

When there are an excessive number of guest customers in the database, it is best to avoid trying to delete all records at once.  And instead delete in smaller date ranges, for example, a week at a time.