I just started trying the BP in the wash trick and it works great!
However, if you buy the pillow protectors be careful that they don't
have a plastic membrane inside them as this doesn't allow the BP to
rinse well. I got 2 cases that had this membrane (no indication on the
package) mixed in with a bunch that didn't have it. Had to re-rinse the
BP a second time.
Lavinia, George and Nappi