Another housewifely question about washing!

From the Persil web site.

Gore-Tex™ garments are treated with Teflon, which makes them water repellent and a fabric conditioner can remove the Teflon, affecting the performance of the garment. It would still be waterproof, so water would not reach your skin, but the garment itself could become heavy and water-logged.

Gor tex things shouldn't be washed in conditioner,I think cause it stops them being breathable.

But that is not clothing.

It can clog the tiny holes in e-cloths so they don't work as well.

What article wash it, kitty, and what fabric?

As you just have, then I think that the second part of your question will answer itself in due course!