cleaning the non-gelcoat side of fiberglass

[Boater_Dave]

How do you clean the non-gelcoat side of fiberglass? The area's I'm talking about is under a hatch, where its rough fiberglass, like the underside of the anchor locker lid. It seems that the dirt just wont let go no matter what I try. Thanks.

 

[Msibley]

MaryKate On/Off Hull cleaner..mixed 50/50 with warm water and a scrub brush. Wear gloves and goggles...very corrosive to skin.

 

[Boater_Dave]

Is this okay to use on the 'raw' fiberglass, versus gelcoat? (as memory serves) Zing says not to apply to cracked gelcoat. I suppose it absorbs and doesn't completely rinse away.

 

[sublimetime]

Spray nine--it will remove all the dirt and black mold spots,and leaves it smelling fresh.Sprayon,stiff brush,rinse well,air dry