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I removed some this week on a job and meths worked well. Mineral Turpentine should be ok as well.
I applied it using a rag dipped in the meths and was able to reach the outside from inside the house. Should not be a problem with the metal frames but it is always a good idea to do a test first. I did actually wfp afterwards and dipped the brush in soapy water to help remove any residue.