Same as you wash the poop knife. In the toilet.
I loved the glorious 3.5.x days. What a fantastic DE it was then. I compiled 3.5.0 from source when it was released because it was going to take the Fedora guys too long to package.
This is one of the greatest features ever. I constantly use it. I always get screwed up if I end up on a windows system and select text and wonder why I can’t paste it with a click.
https://blocklistproject.github.io/Lists/ the Smart TV list under their beta lists.