[Roadsters] coated brake lines

[Tim]

While building a "new" set of brakes for my 1600, I have managed to save a full set of front brake lines from one of my part cars. Unfortunately, they are the coated variety. I would like to clean them up and save them as an emergency back up set (I put NOS lines on the brake set-up I built today).

What is the best and/or easiest way to get this coating of the hard lines? I briefly tried a utility knife but didn't try to hard as I don't want to do damage. 

TIA 

Tim
Dairyland Datsuns