Hey Guys - Need some help. I was preparing to mount the canopy. I was marking my canopy with dry board markers (blue) for the braces and canopy outline. When I tried to make some corrections, this is where the trouble began. I used windex and then denatured alcohol to wipe the markings away. Needless to say, 90% came off but there is a subtle trace remaining on the canopy. Any help in fully removing the marks. Many thanks. Chic