How to delete all of a single item in a backpack

[Tempus]

I just did a really foolish thing... I added 2500 ash to my backpack and its not stacked. I do not want to stack them one at a time. Is there a command to delete all of a single item from a backpack?

UPDATE: I landed up going to an unspawned facet and deleted ALL the ash... That did the trick!