9 Items You're Overwashing and 9 You're Completely Ignoring

4. Winter hat versus cap

Winter Hats vs. Caps: Washing and Maintenance Instructions
For winter hats, if you do not use them regularly, cleaning them once every sixty days—approximately three times per season—is adequate. Most can be machine cleaned, but always verify the care instructions for particular directions.

Caps require a more delicate method. Hand clean them twice yearly in cold water to avoid stains and help them retain their form and shade.