well- it sounds like your alternatives are to get everyone on that side together, and split the cost of a window washer, hang out the window with one of those sponge/squeegees that they use for cars- or leave it alone.

some stores sell extreme spray nozzels for a hose. Maybe you can hook up a hose and blast the heck outta the window from below. OR Pay a kid to break your window so the landlord puts in a clean one....every 6 months...BHAM!....that hood kid....
hehehehe!