GAPCO windows

A quick learner from Lake in the Hills IL says:
Almost all of the vinyl glazing bead in my ancient (>20yr old) windows is cracking. It's almost impossible to get any out without breaking the face edge, and then there isn't enough left to pull the rest of it out. I have two questions.
1. How can I remove this old bead? Heat gun and patience?
2. Can I identify what type it is before I have to pull the entire window apart to get a big enough piece to recognize?

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Paul from SWISCO responded:
Thanks for posting! These are good questions. Age and ultra violet rays are the main reason why this kind of vinyl bead cracks and crumbles. Like you said, a heat gun and a lot of patience are the best way to go about it.

Unfortunately, the only way we can identify what you have is if we see a profile of your glazing. Before you remove all the bad vinyl, try to recover a small piece and take a picture of a cross section so that we can identify it for you.
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