Hi,
in my company we tried using Jira Service Management for a bit.
Didn't work out, so I unistalled/deleted/cancelled the subscription. As a product/subscription it no longer shows up in the billing, so that's fine.
But how do I remove all the custom fields that have been added when we went for the trial version?

They are cluttering my system backlog, I don't want them there... any help?
I do have al relevant permissions, site admin etc.