Deleting an addon, but models still stay?

Alright so, ive tried different addons on my server, and removed them. But when i hold Q goto addons, all the models are still there, but you cant spawn them. Is there anyway to remove these?

did you try restarting the server?

Remove the addon(s) from your game client too.

[editline]22nd January 2016[/editline]

Or the models from download(s)/ folder.