Make sure the PowerForce is unplugged from the power supply.
Remove the dirt container from the central unit and pull the filter cup out of the bottom of the dirt container. Turn counterclockwise to remove the filter cup. There should be two layers of filters; separate and wash both with warm water. Rinse and dry thoroughly and then fit the filters back together and place in the filter cup.
Locate the pre-motor filter, which is beneath where the dirt container sits in the main unit. Lift out the filter, which is small and round; rinse it well and dry thoroughly. Replace the filter in the vacuum.
Set the filter cup back into the dirt container and replace the dirt container in the vacuum.