How to Delete a Custom Field from DB

Hi,

I'm new to Meta Box. This is a N00B question. I did a search, but either used the wrong search term or misunderstood the result.

I created a custom field in the : ee_custom_field in the Custom Fields UI area. I ended-up not needing it, so I deleted it. However, when inserting data via a shortcode (using Oxygen), I can see that the field still exists.

My question is; how can I delete the not-needed field from the WP database?

Thanks!