There's no documented way of doing what you ask short of uninstalling the module and then reinstalling it. that's what's recommended to wipe customer data when moving systems between customer networks for demo purposes. It would also be recommended for an RMA.
When we use Firepower Management Center, the recommended method is to snapshot the VM when it's first installed. Then you can rollback to that.
The less complete method going forward would be to make all policies from copies of the system defaults. Then restore to the default policies and delete the modified ones. You would still be post-setup of the system address, manager and and EULA on the module interface though.
Of course all that is stored in files on the underlying Linux but it would not be a supported method to go in and modify / delete those outside of a support engineer's direction and guidance.