Do you mean you want to delete all data on the Primary and Secondary server?
Well, you can stop the replication, and then you can delete all your VG from Console mode, press CTRL + ALT + X , select "Delete content of units" , select the proper Volume Group to delete, then the system will reboot.
* Please put in your mind that will delete all your data, so if there are any important data you should backup it first before you do this steps, as we are not responsible for your data if you delete it.