Separate solid window from sticky glazing

I used a heat gun on front Aloha plexi window,the stuff looked like hardened cement tape but eventually worked free.The rear paper glass widow wasn’t so lucky on🙄But still used heat gun for easy frame clean up.This method may not work for all situations in density of hardened crud but maybe worth a try?As always,,,very nice job Allan!

I find that when trying to remove sealants, heat is my preferred choice.
I usually heat the metal from the back side to get the sealant (putty, butyl, silicone, whatever) to release rather than heating the sealant which can just make a gooey mess and still leave residue on the metal.

...and here's an added tidbit: For old home glazed windows, we have a tool that lays flat on the glass with a heating element along two edges. The heat produced will even aid in removing the old, dry glazing putty around the wood frame hardened from years gone by. (my family did window glass repair for close to a hundred years)

That's why heat is my "go to" method.

Just my opinion, didn't say it was a good one...
Whitney

No heat gun needed. Use the Multi-Tool with the putty knife style toothless blade on it. That will make quick work of that black glazing tape.