Duraglit as case lube? No, I just use that to shine up really dirty old cases.
A case tumbler with walnut media or ultrasonic cleaner will clean up most cases.
For case lube for resizing I use Hornady One Shot for the outside together with Lee Case Lube and a cotton bud / nylon brush for the inside of the necks. I used to use Lee lube for everything as it's not messy or greasy and easy to use. But Hornady One Shot is even easier as you just lightly spray the cases in the loading tray and it dries quite quickly. Tried RCBS case lube, but never got on with it.
Caorach, I never lube cases for the lee collet necksizing dies. I am sure you don't need to and says so in the paperwork that comes with it. The collet is like a clamp that closes on the final bit of the stroke, not the usual expander button of other dies that really need lube.
best, Craig