Im afraid to use windex considering what it will do to a plaxiglass windshield...soap and water isnt very strong....theres some glue from duct tape on there too thats not coming off either thats the real problem......D

I will check out tomorrow when I go to work, we have special stuff just for the windows on the flybridge top. I am pretty sure it is something Kleen, but I will check for sure.

Plexus

They make special cleaner for isinglass. Definitely do not use anything with ammonia in it. It will destroy it rather quickly. For the glue a little goo gone will work. I had the same problem from some Christmas lights when I lived on my houseboat. Goo Gone very little takes it right off, just wash the window where you use it right away.