Woo hoo! After many hours dealing with a filter that wouldn't come out - it would unscrew a bit, but only a bit!- I undid the bottom of the whole machine, popped the white plastic kick-board off the bottom, undid the two screws holding the filter to the metal casing of the whole machine, and then used a screwdriver to get inside the filter and wrench the filter out. I broke the filter, but that glued back together very easily!
The problem? I had been doing some felting in the washing machine and all the little bits of stick from the rolling mats had broken off and were totally clogging up the filter, and the tube leading to the filter too! It was some serious cloggage happening there.
My advice - don't do your felting in the washing machine!
erininnorthcote, March 2012