cleen up will not do it.

Lonepig. Depending on what it is, its probably not worth it to get totaly anal about quads..

if you see a bump when its smoothed, its prob a try or Ngon. and you should cheak the mesh where it will deform for more than just for quadness anyway.
In other words if its not causing you problems.. fixing it might cost heavyness. Heavyness = harder time UV, painting weights, rigging. slow display.

sean your post that might have started this LonePig. I only sean one tryangle on the alien face that would have given you problems. right buy the corner of the mouth. You killed it. I'd relax a little and pat your self on the back.

Just my take on things btw.

Good spot for Jango though also ! that would have coused problems there with deformations.