Wash in Granger’s G-Wash Cleaner Plus—an effective, residue-free cleaner. You can also treat the garmet with a DWR (Durable Water Repellency) spray. Marmot recommends Granger's products. Typical laundry detergents contain fabric softeners, fragrance and color brighteners which are water-attractive residues—not something you want on the surface of your Gore-Tex fabric. A mild powered detergent, such as Lux flakes is acceptable if thoroughly rinsed.
Do NOT use a liquid detergent on Gore-Tex fabric. It leaves a residue, which clogs the pores of the Gore-Tex and causes leakage.
Never use all hot water or all cold water on Gore-Tex. Always use a warm wash and a warm rinse. It is extremely important to rinse the garment well. We recommend two rinse cycles or wash it once with detergent and again without.
Dry in dryer on LOW heat, at the end of the drying cycle, you may increase the heat to WARM and dry for an additional 15 minutes. This will remove some of the wrinkles from the fabric. Remove at once; do not allow the garment to remain in the dryer (it may cause burns on the fabric if it sits on the hot metal).
You may use a spot cleaner to remove stubborn spots before washing. Granger’s G-Wash Spray Cleaner Plus works well.