How to delete Ad campaign

How do we delete an Ad campaign? We have so many that we no longer use nor do we need the data from...our Ad campaign manager takes forever to load so hoping to delete the ones that we really don't need but we cannot find a delete or trash button any where?

Removal of an ad campaign is not currently supported.

The Ad Campaigns Manager is deprecated and no longer supported. Access to the Ad Campaigns Manager is still provided so that you can access your prior statistics, and there are currently no plans to remove the Ad Campaigns Manager.