Machine wash the garment in warm water with a small amount of liquid detergent. Avoid powder detergents, fabric softeners or bleach. Technical fabric cleaners such as Grangers Performance Wash work best for this because they contain no additives that can interfere with garment performance. Rinse the garment twice to make sure it’s free of detergent. You can hang dry or tumble dry on a warm, gentle cycle—double-check garment care instructions to see which method to use. Once the garment is initially dry, there’s an additional step. Dry it for an extra 20 minutes on medium heat to revive the DWR treatment. You can also spray it with a spray-on DWR like GRANGERS PERFORMANCE REPEL PLUS, to add water repellence.