Particularly things like nice underwear & silk pillowcases?
I try to hand wash with special detergent (Clothes Dr silk/delicates wash) but after a while the colour of the items fades and the items aren’t as soft as they were when new.
I just bought a blue lingerie set, soaked them in the sink with cold water and the detergent, set them to dry…and the set now looks grey! 🙁