Removing old staging tables/files

Some time ago we had a staging site and thought we could get rid of it by deleting the staging folder in the CP File Manager however when we come to do a snapshot backup, these staging entries still show in the snapshots available.
I went to phpmyadmin and ran a query to drop all the tables named wpstg! etec using this query

SELECT CONCAT('DROP TABLE ', TABLE_SCHEMA, '.', TABLE_NAME, ';')
FROM INFORMATION_SCHEMA.TABLES
WHERE TABLE_NAME LIKE 'wpstg0_%'
or TABLE_NAME LIKE 'wpstgtmp_%'
or TABLE_NAME LIKE 'wpstg0_%'
or TABLE_NAME LIKE 'wpstg1_%'
or TABLE_NAME LIKE 'wpstg2_%'
or TABLE_NAME LIKE 'wpstg3_%'
or TABLE_NAME LIKE 'wpstg4_%'
or TABLE_NAME LIKE 'wpstg5_%'
or TABLE_NAME LIKE 'wpstg6_%'
or TABLE_NAME LIKE 'wpstg7_%'
or TABLE_NAME LIKE 'wpstg8_%'
or TABLE_NAME LIKE 'wpstg9_%'
or TABLE_NAME LIKE 'wpstg10_%'
or TABLE_NAME LIKE 'wpstg11_%'
or TABLE_NAME LIKE 'wpstg12_%'
or TABLE_NAME LIKE 'wpstg13_%'
or TABLE_NAME LIKE 'wpstg14_%'
;

This didnt remove anything.
I looked through WP_Options and couldnt see these tables.

Any suggestions?