Good question: I will probably horrify textile conservationists and museum curators world wide but, personally, I usually do .
If the piece is fragile and is going to be glazed & framed that’s fine , no need to head for the laundry, but for items that I intend to actually use, then the ability to launder them must be a given. If not, why buy?
After 40 + years of buying and selling these little gems, I am successful 99.9% of the time as I only look for robust bed and table linen, curtains, cushion covers etc. The intricate cut work and embroidery cloth above left