I spoke to my MIL in the UK & she asked me to post if anyone knew how to get mould out of curtain lining,
I could only think of a bleach solution but that would take the colour out.
I'm not sure if they are dry clean only or machine washable. She said it's just the lining at the base of the curtain from condensation. She would have to separate the material from the lining in order to use a bleach solution. Would an Oxy action spray work?