Dirty Tank Assembly for Select BISSELL CrossWave Multi-Surface Cleaners. Assembly includes bottom tank and lid To Empty the Dirty Water Tank, follow these instructions: Press button on top of dirty water tank and pull out. Remove top of tank by grabbing lid in recessed area on either side of filter to remove. Remove filter from lid. Remove debris from mesh screen of lid. Pull strainer tab up and out of tank to separate debris from dirty water. Dispose of debris. Pour dirty water into sink and rinse. Replace strainer and dirty tank lid. Insert bottom of tank first. Tilt tank towards machine until it clicks into place. Dirty Tank Assembly for Select CrossWave 1640769