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First clean window area thoroughly with soap and water and dry.  I recommend using rubbing alcohol and a soft cloth to remove any left over soap residue or film on the window.  This should leave you with a clean surface to work with.  Peel backing from sticker and place on to the window surface.  Press firmly on each letter to insure good contact.  Finally, peel the clear backing away from the stickers. Run your hands over each letter one more time to ensure a good stick and you're done.  Enjoy your stickers!