You can delete user data from WebHosting Plesk only by deleting the user's subscription from CloudBlue Commerce. If you are using CloudBlue Commerce with Billing, you need to destroy the subscription in Billing.
The service module does not write personal data to platform log files on the management node when the logging level is set to INFO or a less verbose value. The service module may write some personal data to those log files when the logging level is set to DEBUG or a more verbose value. By default, the logging level and the log retention period are DEBUG and 28 days correspondingly, which means that you may need to manually remove personal data from those log files.
See also