I run an OCE Arizona 350XT flatbed printer and have had one heck of a time printing on aluminium composite material. After gently peeling away the protective film that the material is covered with, I still get "chatter marks" or light spots in the print. I have tried every chemical I can think of to clean the surface as well. 99% alcohol, 91% alcohol, mask-off & windex, just to name a few. The streaks and spots are driving me nuts!!!! Help!!!