Mildew & Fabric
In this case the cause was that all windows and fittings were removed for prep work and then the entire boat was sealed for painting the deck. Unfortunately the removal was done outside and it rained just prior to being moved indoors for the work. This caused the lack of ventillation and the warm moist environment that were ideal conditions for mildew.
I am looking for specific brands so that I can remove the mildew (ie kill) without discolouring the hull liner. I will attempt to clean a small out of the way location first.