How do you remove devices

Configuration
1

How do you remove devices like obsolete IKEA tradfri devices.
I’m looking for a tutorial or a function like removing entities.

2
  1. In the developer tools click on the info icon, 2. In the intergration entities list tick box and see if it have a bin icon. 3. The dreaded editing the two files in the hidden folder in you config folder call .storage, the files core.device_registry and entities_registry, as always, backup before editing
3

Home Assistant still shows me two devices that have already been deleted from the Phoscon/Deconz integration.

How can I remove those zombie devices from HA? I know about the two files mentioned earlier in this thread. Is there still no easier way the delete the zombie devices from HA?