How do you clean an oilskin hat?

To clean an oilskin hat, first, gently brush off any dirt or debris using a soft brush. Next, use a damp cloth with mild soap or a specialized oilskin cleaner to wipe the surface, being careful not to soak it. Rinse with a clean, damp cloth to remove soap residue, then air dry away from direct sunlight or heat sources. If necessary, reapply a wax treatment to maintain its water-resistant properties.