White residue on print using MakerJuice G+

Hi gang,

My first print with the Titan was a success! Did not expect that. I printed the V-shaped test article at 50µ using MakerJuice G+. One question that I have is that there is a white residue between the fins. What is this and how can you remove it or prevent it? Here’s a photo:
https://goo.gl/photos/3oojyRZJhwmqiPXY6

thanks,
-Robert