You will need to employ some EQ-kung fu of precise editing, and equalise unwanted frequencies out manualy. Try multiple very narrow bands (as opossed to a high-shelf EQing, which would hamper all the high frequencies, including recorded material), spiking the frequencies you don't want down. But it's going to be a hassle. Probablly not worth the effort IMHO, because you're looking at A LOT of editing and (very possibly) an extensive automation pattern. You could try with de-esser too, but chances of success are slim.
You'll probablly be better off just moving your setup around and re-recording. Try closing window and moving the gear away from it, with mic facing oposite wall, preferably with some screen from side of the window. If you did that already, maybe you should think about changing the rooms, too.