I've had a DC25 for 3.5 years now, and very happy with it (I had a DC01 for nearly 20 years, before that.)
I clean the filters as prescribed, BUT: the instruction for the motor filter is that you
"Rinse and shake filters under tap. Turn over and tap very firmly to remove motor emissions. Repeat 10x until water runs clear."
Well I have NEVER seen anything produced as a result of this rather tedious procedure for the motor filter. (The other, dust-bin, filter always takes some washing through.)
Any comments, folks?
Cheers John