I got all of my rusted out spoiler unhooked but I cant seem to find out how to disconnect the whole rear wiper arm to pull my spoiler off... I have a 84 and a 86 manual, but both do my no good, I cant find anything that says how to disconect it to pull the spoilerer off. I have a 1985 300zx 2 seater if you need to know.

 

I've never removed the spoiler off a Z31, but I'd think you'd remove the nuts from the front and/or back side. Have you taken off the interior hatch panel to see if you can get access to the wiper?