You should launder your rain jacket more frequently than most people would imagine, especially after using it heavily or when it has come into contact with dirt and oils that can cause damage to the water-repellent finish. Please adhere to the washing instructions as indicated on the source label, usually low temperature with synthetics. Consideration of the manufacturer's recommendation to tumble dry the jacket will assist in setting the durable water repellent finish to the jacket fabric. The DWR treatments should be reapplied if necessary to sustain the water repellency of the jacket.