I want to thank-you all for your responses. I did find some great resources on the web for developing a best practice for our unit. I am saddened by what our nurses were doing with the equipment, and embarassed by it, too.
What I have found in my lit search is basically to suction the mouth first with bulb syringe or cath, then the nose with either a bulb syringe or cath. Saline drops will help to mobilize the secretions. We are going to make our practice that an 8FR is good for the mouth and a 6 FR is good for the nose. We'll see how that flies.
THANKS for all the responses!!