I assumed everywhere except the USA had converted to plastic... It's so much better.
Paper cash is made from cotton fiber, it easily survives the washing machine.
Not in my experience... but then I haven't had "paper" cash since 200x (small x).
Euroes are cotton fiber and washable. https://www.youtube.com/watch?v=5mCVOAXLg00
That's the only thing I'll miss if Romania ever switches to Euro. Cash you can launder. Literally.