<VV> glass question

[Randy (Cap'n) Hook]

I have a question.  What, exactly, would be the best way to remove a windshield and back window from a '65 4-door?  Numerous people have said to "use a piece of 'piano wire' ", but no one who suggested it had ever done it that way.  So, where does one GET a piece of 'piano wire'? A friend mentioned a tool Napa sells to accomplish this task.  I got one.  It works, sort of.  The problem is that the black goop they glue the windows in with has pertified and is as hard as concrete.  A friend gave me a very small piece of braided wire.  This worked for about 5 inches, then frayed and broke.  These glass items are tinted glass and I really don't want to break them, as that would ruin the complete set.   Anyhow, I was wondering.........are there any chemicals I could soak the black goop with to make it softer and easier to cut through?  I thought about trying to lace it with a little gasoline, but don't want to hurt the tinted glass.  All thoughts and opinions welcome.  I need help with thi
 s one.

Randy (Cap'n) Hook
'69 Monza coupe
'65 500 coupe