Cleaning the shower liner doesn’t need to get to the level of removing it or placing it in the washer at all. A nice eco-friendly non-toxic way to get rid of all germs and mildew from the shower curtain is to go buy a $0.60 bottle of Hydrogen Peroxide and place the peroxide in a spray bottle. Some Hydro Peroxide bottles now already come with a spray head themselves. Just spray down the Hydrogen Peroxide all over the shower curtain and let it sit. Since h20 aka water is technically two parts hydrogen with one part oxygen, once the hydrogen peroxide just sits there for a few minutes it reacts with the oxygen in the air and re-converts into simple water. Hydrogen Peroxide spray in general is an AWESOME eco friendly way to kill all germs on any surface. I use it on the kitchen counter, my leather couches and pretty much everything else. The consumer grade hydro peroxide found in stores is only at a 3% concentration so no need to worry about toxicity. Hydro Peroxide only becomes dangerous at the industrial levels of 30% and above, 3% is perfectly ok, I even swish it around my mouth sometimes to kill germs before brushing my teeth.