I noticed the other day, that after almost 30K miles, the fabric draft protector think at the front of the sunroof (when opened) was looking rather caked with stuff.. Now as this is partially see through, and only fabric material (i.e. no/v.v.light pressure only can be applied) - any suggestions as to what products/how I could clean this up? Was thinking initially a general TFR/grime cleaner like AutoFinesse citrus power might do the job.. thoughts?