back window

i just took out my 1968 dodge coronet 2door hardtop back window, does not have gasket, just some back goop, how do i clean off all the black
goop from the windon channel, so i can repaint and
replace the glue and the window, what is the easy
trick, i have been using the scraper and wire bush, is there a trick in cleaning the back window channel?

scraper, brush & eventually mineral spirts & a scotch-brite pad...

so no trick, just elbow grease

If it was easy everyone would be doin it