I put a towel down, to go in the washing machine, a couple of weeks ago. Zev immediately claimed it, so I haven't been able to wash it, or use that stool since! It's her favourite location to sleep, when not at the bottom of the bed, waiting for me to get up and prepare her breakfast.
it's getting towards the point of becoming so heavily fur covered, that I'm going to have to wash it, and substitute one of Zev's own towels (she has a couple of old ones, that are normally used with the cat carrier for visits to the vet or cattery).