Both products are great. Graingers slightly takes the lead for me though. Here’s the process I use to wash my Goretex kit;
1. Run your washing machine empty on a hot cycle (60-90 degrees) to clean out any residue. Make sure there’s no powder / softner residue in the drawer.
2. Wash jacket following the instructions on the packet. Set your machine to do an extra rinse if it has this option.
3. Allow the jacket to drip – dry.
4. Once dry, put in the tumble dryer on high for 10-15 mins. This extra heat reactivates the protective coating which stops water from soaking the material covering the Goretex membrane stopping it from working.