Help my ignis dishwasher seems to be not getting rid of dirty water. ?

I`ve just run a pre-wash and poured boiling water down in the filter area hoping this might clear any blockages .Its draining water as the pipe can be seen moving and water is draining away .Incedently there is no water in the filter area when a pre-wash is done yet before when i looked there was after a 40 degree wash .This water was dirty .should this water be clean clearish water or filthy dirty ?
Having done this pre-wash clean we will try again .
Any thoughts on this will be appreciated .

john d
January 2010