My Account 
It sounds like you are printing with the support settings in your slicer turned on and printing everywhere.
The model is designed to print with no supports, so there should be nothing in the windows when it prints.
depending on how thick the supports are at the point of contact is the big question. most of the time I would go in with needle-nosed pliers to get the majority out and then use a hobby knife to clean the connection points of any leftover filament.