I love my twin tub!
Dog hair and all manner of lovelies (dust and hay seeds a few weeks ago, I was On the tractor with the haybob going) get caught in net or stay on the bottom when emptying, so is easy enough to clean out. Several whizzes later (set machine to wash whilst emptying at same time using a hose pipe to put more water in, gives it a good clean out. I usually put bleach through it then just to clean it for next time!)
I was brave a few years ago, unplugged it, got the drill out and unscrewed the central pin, expecting to see a fancy mechanism etc. Nowt like that!
Like I said, love my twin tub.