Wing window

[SRU1436]

I am currently replacing the window felt, outside seal and window tracks. No issues so far, except the wing window track. I pulled out the wing window to replace the track as everything it’s original. When I pulled the track out, it was glued in there from the factory. There is left over window track (Looks like it was some type of carpetish material) and some harder glue. Anyone have a recommendation on how to clean out that area? See picture as a reference. If you need more pictures let me know.