Oh, and how I removed the metal tracks....I turned the glass on it's side, sprayed the glass & rubber with soapy water and took a rubber mallet and beat the tack from one end where the connecting tab is. It wasn't easy, but once it gets moving, the track slides right off.
And to put the metal track back on after cleaning...first, I located the original location of the track, installed the rubber gasket on the edge, then with the glass resting on my shoes, soaped up the gasket, then placed the metal track over the gasket, and with the rubber mallet, I carefully beat the track straight back down onto the rubber gasket.
Well, right or wrong, that is the way I did mine. And I didn't destroy the metal tracks or glass.