How to delete datablocks?

Is there a correct/better way of deleting/removing unwanted datablocks such as models, textures, materials created?

It seems you can unlink it but can’t delete it completely. I’ve tried searching an answer in this forum but no complete answer was given.


Save your .blend, close blender, open blender, load .blend
[Edit:] Not sure if you need to close/open blender, save/reload might work also.