ok- well then I'd use a torch to remove it, but I would use propane instead, and a non-splatter catch pan. You do not want this on you. This is the stuff that takes the "lead" outta YOUR pencil.......follow that?
If you get too much heat on your panel it's going to warp it- so keep the flame just close enough to it to start the melting, use a swirling motion to heat it & a brush to push the lead off. Easy does it & brush it down to the metal & stop. It will still look like there is a little more- but that will be because it has been "tinned" to hold the lead. That is a thin film of lead that will have to be sanded off. Use rubber gloves & a particle mask to do this.
Good Luck & be careful.

P.S. Keep a fire exit close at hand.