Dirt Devil DD9002 Instruction Manual page 8

2. If the cotton silk with large lump in the dust cup cannot be poured
out, take off the dust cup and take out the filtration system in the
dust cup, and then pour out the garbage in the dust cup, as shown
below.
Press the button to
take down the dust cup
Pull out the filter system by holding you fingers
in both places indicated by the arrow
3. The dust cup and filtration system can be cleaned with water as
followed picture.