This window has a couple decals on it so we're going to take them off. It's not that difficult. This one is old and breaking off so it would be very hard to remove. I'm going to heat it up and be careful not to overheat it. Once you get that decal nice and hot it will get soft and just pull it away using a plastic chiseler. heat makes all the difference in the world. Get it warmed up a little so it gets pliable. This one, however, left some adhesive. So what we're going to do is take some adhesive remover and spray the tacky area real good and let it set for just a minute. You can see the more you work it the more it will turn into a gel. That gel, I find, actually helps. So now what we're going to do is rub the area with rubbing alcohol and that should leave us with a smooth surface. I do this a couple times just in case we missed a spot.