My sailboat sails are made of Dacron, white in color. I have seen small black specks in certain areas, which I believe to be mildew stains. Could you please tell me how best to remove the black specks and also let me know is Dacron is susceptible to fabric damage from the use of mildew cleaners? Thank you. E.M. Raasch
Short answer here is that Dacron™ is a trademark name for polyester. This material is widely used in such things as tires, fire hoses and curtains as well as clothing. It is also widely used in boating for sails, ropes and even combined with fiberglass for the hulls.
One of the reasons this material is used is it can be easily cleaned and bleach is not a problem here.
For the mildew stains I would try: