The Storm Cleaner is an easy to use specially formulated cleaner that is suitable for use on all materials including Gore-tex Sympatex reg e Vent reg & others & will freshening up your technical outer wear & equipment This cleaner is so easy to use just put 75ml of Storm Cleaner in with your outdoor gear in your washing machine & it will lift contaminants in preparation for reproofing without damaging the manufacturers original treatment This 300ml bottle of Storm Cleaner will do four washes but as you can put all your gear in together this will go a long way The best thing about the Storm Cleaner is that if you do need to proof your gear then you can add Storm s Proofer available separately to the same washing machine cycle which is far less hassle & saves lots of time than having to do it separately