You can wash laundry with yucca.
There are a lot of different types of yucca. I have soapweed
yuccas, (yucca glauca). As I understand all yuccas have natural
saponins (soap qualities), but you may want to check which yucca
you have, and what parts of the plant to use. I use the roots, but
I've heard of being able to use the leaves and stem too.
The root is stringy and fibrous. If you just throw the root in
your washing machine, your going to have a mess.
I kind of beat the root up a bit, to break it open, then I put
it in a cheese cloth type bag. I use a WonderWash, a hand cranked
barrel washer. I throw the bag in and agitate with my clothes.
I use yucca to wash my body and hair too, I stick some of the
broken up root right in a used water bottle, leaving some head
space to shake it up.
You're not going to see the lather and suds that most people are
use to with commercial laundry soap. I think the trick there is
adding glycerin.
Good luck!
i can see you right now