Delete Dropdown List

I need to do some housekeeping on a Sugar instance and this includes removing some redundant customised dropdown lists.

In Studio you are unable to delete DD lists directly.

I am familiar with the language files in custom and also that DD lists are referenced by field definitions in various places (including in the database in fields_meta_data)

Is there a way to manage unwanted dd lists out of the system in a way that maintains integrity.

Otherwise you can end up with a library of DD lists which becomes increasingly difficult to manage over time.

Thanks

Neil