For windows that are caulked or whatever with the rubber seal use a utility knife and a thin blade flat head screwdriver. Run the knife against the aluminum on the side you see the caulk/seal and cut that little strip off then take the SD and try and wedge it between the alum and glass and pry up on it a little. After 2 or 3 times of prying the AL will move and you should be able to pull it by hand. Then pull the rest of them off. You might crack the glass but that's better than it shattering into tiny pieces.