…if you're still curious, https://en.wikipedia.org/wiki/Handwashing_in_Judaism is a good place to start.
If you're curious about what an Exshtender™ is, https://www.shapeways.com/product/GBT4GCGWE/exshtender-v5-20 has a good description, including a link to a video of how to use an early version. https://www.treatstock.com/3d-printable-models/3659837-exshtender-v539 tends to be cheaper.
The author marked this model as their own original creation.