Nikwax TX Direct Spray-On is the perfect spray treatment for coatings or laminated coverings, double-layer lined garments and all compound membranes, synthetic sleeping bags and items that cannot be machine washed such as tents and bivy bags. All waterproofing coatings, and Nikwax coatings are effective if garments are kept relatively clean. Dirt attracts water and blocks the water-repellent coating. Also, traditional washing powders leave a hydrophilic residue which covers the water-repellent coating.