When a customer wants to delete properties from showing in the CMS there are a couple things that need to be done or else the properties will still be visible.
1. Once the properties have been determined that they will never be used again, you can begin the removal process.
2. Remove all properties from the code base itself. This includes removing it from any .cs file and removing all references to where the properties are called upon in various areas of the codebase.
3. Finally, to remove the property from the CMS UI - they must delete the property by navigating to Admin > Content Types > PageName > find and delete the property.
This will ensure that the property is removed and no longer visible in the CMS.