Has anyone else found the DC59 filter’s design awkward to clean? I’ve followed the cleaning instructions regularly. The filter still became full. Youtube instructions suggested taking it apart, which made it possible to clean it efficiently.   But why are the filter’s plastic head/rods not designed to unscrew from the filter bag? The filter head design itself is made from a feeble plastic that isn’t strong enough to withstand being separated from the filter bag. Debris sticks to the bag’s inside making rinsing it under running water inadequate.  So after a while this debris impacts & needs to be thoroughly cleaned, which means having to remove the plastic head.  Please Dyson make this head a screw-on fitting.