J/30 Class Association Forums J/30 Forum The Boat, Sails and Equipment black streaks

As the black streaks appear use 3M Black Stream Remover. Use BSR prior to waxing as well. Teflon wax the topsides (hull sides) to faciliate easier removal w/BSR.

The source is pollution in the air. Think acid rain, but in this case it's black rain. Rain isnt clean unless you are in the middle of the ocean, and even then...