OK, this may be the dumbest question ever but I am trying to put a Malibu decal on the back window of my truck. What is the best way to make sure it adheres well? I have put many stickers on but this one seems different. I peeled off top layer, placed it on the clean windown, but the actual decal is still stuck to the backing and even rubbing it doesn't seem to make it adhere. What am I doing wrong??? Thanks