How do I get a unknown substance stain out of a Gore Tex Shell

yeageraaron, Found this info. on cleaning stain, from 1st link below. You may want to try cleaner on a inside/hidden inconspicuous area prior to application on stain to make sure it does not remove color. To remove grease from a garment, dampen the stain and rub in dishwashing detergent. Then wash the jacket in warm water with plenty of mild laundry detergent. If the stain persists, sponge it with a safe cleaning fluid Renuzit or Carbona or mineral spirits, which can be found at most markets or home improvement stores. Thre are a couple other links with washing/stain removal info. also. Good luck. I hope this helped you out, if so let me know by pressing the helpful button.

http://www.patagonia.com/product-care.ht...

http://answers.google.com/answers/thread...

https://www.gore-tex.com/support/care/wa...