I know this has probably been done to death, and I am now going to look through old threads.
There's no obvious block, I have had drain unblocker stuff down the kitchen plug hole and took apart the pipes underneath. I also pulled the machine out and put unblocker down the pipe coming out of the machine, but it's the drum that really stinks and I have no idea why! I dfon't leave washing in there and I dry out the rubber rim after every load...........