Pointless Question

A pointless question from the Harry-Potterverse: if you can't give a house elf clothes or they'll be freed, who does the laundry in homes wealthy enough to afford house elves?

Pointless corollary: who does the laundry at Hogwarts?

Update: this article (on a site that J.K. Rowling herself sometimes uses for reference) says that house elves do do laundry. Anyone know where we can contact Ms. Rowling and ask her?