I'm actually not sure what the material of the curtain is but I think it's probably cotton or linen. Someone (I'm not saying who) has got foundation on the dark blue curtain, I think she's tried to get it out with shampoo in one place and it's spread a bit.
If I can't find a way to get it out this could be the end of the relationship with this particular family member!!
Any advice? Housesitting!