how do you change or even get at the spray nozzles. Mine are clogged. 1992 f150 4x4 ext cab

 

mine suck and don't hit the windshield unless the wind is blowing the right direction. i have been considering swapping to the ones that mount on the wiper arm (the chev style, please don't hate me lol)at least that way they would hit the window without having to stop.

but to get at the factory ones you need to remove the valance between the windshield and hood. should be a few screws to remove it and removing the wiper arms

 

You might try removing the lines @ the fluid pump and shooting air through them. If there's any clogs that should remove them.