In reply to TobyA:
I think the main problem with eVent is that the membranes pores trap oil, grease and other mank which compromises the waterproofing.
If I remember rightly, the original concept was that the membrane itself had the urethane coating built into it, whereas gore has/had? an individual PU coating to protect the membrane.
I think the best thing for keeping event going is a solid 40°C detergent wash to clean the membrane, followed by a serious overdose of reproofing agent.
I often wonder if the 'open' membrane idea is inherently flawed because of contamination and what that means for neoshell and other membranes of the type.
Post edited at 19:03