Here you go:
Cleaning a Dry Filter
NOTE: For best cleaning results due to accumulated dust, clean the filter in an open area. Cleaning SHOULD be done outdoors and not in the living quarters.
1. Remove filter from Vac. Gently tap filter against the inside wall of your dust drum. The debris will loosen and fall.
2. For thorough cleaning of dry filter with fine dust (no debris), run water through it as described under "Cleaning a Wet Filter".
Cleaning a Wet Filter
After filter is removed, run water through the filter from a hose or spigot. Take care that water pressure from the hose is not strong enough to damage filter. Allow filter to dry out before storing.
IMPORTANT: After cleaning, check the filter for tears or small holes. Do not use a filter with holes or tears in it. Even a small hole can cause a lot of dust to come out of your Vac. If your filter is worn or damaged, replace it immediately. Allow the filter to dry before reinstalling and storing the Vac.