delete prefab contents

i was just wandering if anyone knows a way to delete the contents inside a prefab in the project window, for example a mesh stored inside a prefab which u cant see in the scene to delete.

would i have to use a third party asset, i think there is two that do this but a bit pricey

Just click the prefab in the Project view and delete the components you don’t want in the Inspector. But if you want to delete a child of the prefab, then you must place it in scene, delete the child in the Hierarchy view, select the parent and click the button Apply to save the changes in the prefab.