Durable Water Repellent (DWR) treatment enhances the performance of a garments outer fabric by encouraging water to bead up and roll off the surface. A DWR finish bonds to the textile fibres to make them water resistant and improves existing water repellency of fabric.
DWR diminish in performance due to a number of factors—dirt, body oils, abrasion and repeated launderings. Often they can be revived by a washing and a few minutes of tumbling in a clothes dryer set on low or medium heat. With heavily used garments, DWRs eventually need to be reapplied by a spray-on or wash-in product.
Wash the garment with an additive-free detergent or soap. You can use regular laundry detergent, but you may have to give it an extra rinse or two to get rid of any residue. Do not use liquid detergents or delicate detergents as they contain fabric softeners that can impede the effectiveness of the DWR finish.
- Machine wash your garments using the machine's complete cycle.
- Repeat the rinse cycle once or twice to ensure all soapy residue is removed.
- Dry at medium-hot setting, and let the garment cycle for 15 minutes after it's dry to revive the original DWR finish. If you have an iron with a cool synthetic setting, you can lightly iron the garment to perk up the DWR treatment.
Wash the garment with an additive-free detergent or soap and apply a DWR treatment. Use a spray-on treatment for 2-ply garments. Wash-in products work well for both 2 and 3-ply garments.
- Machine wash your garment.
- While the garment is still wet, saturate the outside with the spray-on product and follow the manufacturer's directions. If you're using a wash-in product, follow the manufacturer's directions.
- Dry at medium-hot setting.
- Clean any surface in your home that may have come into contact with the treatment. It is also a good idea to run your washing machine through a complete cycle while it is empty to remove any residue.