Shurhold's hull brushes is designed for more specialized work beyond just regular washing.  This series includes attachments compatible with Shurhold handles.  These are based out of a solid wood block with a rubber wrap-around bumper to prevent marking any surface.  Shur-lok attachments that quickly lock into any Shurhold handle include:

• Soft Hull brush - 8 inch brush with yellow polystyrene bristles designed for working on vertical surfaces and is safe on gelcoat, clear coat, fiberglass and paint 
• Extra Soft Hull brush - 8 inch brush with blue nylon bristles designed for working on vertical surfaces and is safe on delicate surfaces