Nikwax Tech Wash safely revitalises breathability and water-repellency. It is a non-detergent soap which can be used regularly to clean clothing and equipment without damaging the Durable Water Nikwax Tech Wash safely revitalises breathability and water-repellency. It is a non-detergent soap which can be used regularly to clean clothing and equipment without damaging the Durable Water Repellent (DWR) coatings. Use this product instead of detergents or washing powder.