I've just gone to empty the dryer and it's happened again, a duvet has tied itself in a big knot and it's still damp in the middle. I tried to unknot it for ages but ended up giving up as I managed to hurt my finger.
What can I do to stop this? I already do the buttons up before washing. It was just a duvet and pillowcases so it wasn't overloaded. A quick google suggested some American gadget called 'Wad-Free' but they cost £25 and the reviews are mixed!