How to remove all unused blobs - scheduled clean up jobs not removing all unused blobs

Hi there,

I have ran the following scheduled jobs:

'Remove Unrealted Content Assets'
'Remove Abandoned BLOBS'
'Clear Thumbnail Properties'

But I am still getting errors around media which is not in use. In my Global.asax file I have implemented 'Application_Error' which is how I found out about the unused media still trying to be found. 

When changes to resources happen the application pool for the website will recycle. We use httpcontext current session to create a session at the start of the checkout journey for a user and then gets updated along the checkout process. If the application pool recycles the httpcontext current session becomes null. We are not 100% this is what is causing the session to go null but need to eliminate this as a possible cause if its not causing the issue.

Does anyone know a way to remove all unused media?

Thanks, James