We recommend against machine washing your hats as it can cause damage. For maintenance: Avoid washing machines or dishwashers. Use spot cleaning or gentle hand washing with clothing detergent for minor stains. For cotton hats, occasional gentle hand washing is okay, but beware of sweat stains and fading over time. Polyester hats can be rinsed in the sink or shower after use, with spot cleaning as needed. Always air dry hats; never use a dryer. Be cautious with leather patches; avoid soaking to prevent staining and warping.