[Videx]

You can cause a lot of trouble 'cleaning up', so unless I know exactly what each file does, I leave it. Ditto db tables. They do no harm just sitting there.

Now, if you get sql errors from old mods that's a different problem. Like most mods, they probably left behind cron jobs. First make sure they aren't running via Scheduled Tasks in AdminCP. But then you'll have to go into /includes and delete any relevant files there - you'll just have to manually compare the folder to what you have in a fresh vb4 folder.