Yes, done a couple of Cinelli 1As. Wet sanded the ano off with 360 grit paper, then repeat with 1200 grit to get it smooth, then polished up with Autosol.
I did try the Mr Muscle oven cleaner (sodium hydroxide) in a plastic bag method to strip the anodise, but it didn't seem to touch it.
Anyone ever completely stripped the ano from a kalloy or similar stem?