Is there any way to purge EVERY unused data from a blender file?

Question

How can I remove any mesh, texture, material and others from a Blend file? Now I have a single scene with one object that has no material, nothing is hidden, I am not in local mode, I tried every File/Clean Up/... commands, but yet there are a lot of previously used textures, meshes and other stuffs in the Blend file. Is there a way to get rid of them without manually hunting them one by one?

I wonder if Blender has a one click solutin for efficient clean up/purge functionality.

An example file: https://easyupload.io/7f3e2c

Answer 1

Not unused, rather not linked to scene.

There are no orphans in the blend file. For example running script here details this object has 16 users, and "who" they are

---------------------------------
bpy.data.objects['tümpanon blokk']
Users: 16
("bpy.data.objects['Ablak4_Ablak4.057']", "bpy.data.objects['Ablak4_Ablak4.058']", "bpy.data.objects['Ablak4_Ablak4.059']", "bpy.data.objects['Ablak4_Ablak4.060']", "bpy.data.objects['Cimer_Circle']", "bpy.data.objects['Cimer_Circle.002']", "bpy.data.objects['Proba_Cube.001']", "bpy.data.objects['Proba_Cube.003']")

and as mentioned by Cranzitz likely these objects are linked together via pointers used by an addon, perhaps these custom properties give a clue...

>>> C.object['
              bc']
              graswald']
              hops']
              kitops']
              lod_original']

To deal with these can remove all objects not linked to the scene. Here is a script to do much the same as select all but one object in outliner data API UI as suggested. In this case select all objects not used by a scene

import bpy

obs = [o for o in bpy.data.objects
        if not o.users_scene]
        
bpy.data.batch_remove(obs)

after which any meshes etc left over will be mostly orphaned and can be dealt with accordingly.

Removing kitops.

Further to the reasons this happens, an addon like kitops associates objects via pointers to other objects, effectively upping the user count and leading to

Object referenced by PointerProperty in Python can not be deleted properly

Not deleting objects with users is a safety feature. IMO perhaps the makers of the addons could add an operator to remove those dependencies.

For example this script will remove the custom property added by kitops

import bpy

for o in bpy.data.objects:
    del(o["kitops"])

leading to a number of objects appearing as orphans.

Answer 2

I'm pretty sure that you use some specific add-on like kitops, because the objects that you are talking about used somehow. You can see this by number of users, that currently is one:

but should be zero to be removed by Blender's clear purge data command. In this case, I belive the best way to remove it is to open the Outliner in Blender File mode:

Select objects that you want to remove using Shift (objects that are not presented in the scene marked by gray color, so it is easy to select right ones) then press X to remove (or from context menu):

Then you can use File -> Clean Up -> Recursive unused data-blocks for removing all related data like Meshes, materials ant textures.