How to remove all plain beige buses

Hi,

I've changed every single livery entry in the ailist to one set repaint, and all non-beige buses are now in this repaint.
However, all plain beige buses are still showing up as AI when I play the map.

Short of editing the actual beige templates, is there a way of removing these coloured vehicles?

Thanks for any help.

scanaiomnidekka