Dirt Tank Assembly for Select BISSELL SpinWave Spin Mops, including SpinWave + Vac All-in-One Powered Spin-Mop and Vacuum To empty the Dirt Tank, follow these instructions: Press button at bottom of tank to release. Rotate up and pull tank out to remove. Pull lid up to remove. Separate filter by pulling blue cage off. Empty tank. If contents appear wet, remove clean tank and clean out the vacuum air path. Recline machine for easy access and use a small bottle brush to clear the hose-like path inside the machine. Separate filter from tank and tap on side of trash bin to remove dust and debris. If filter feels wet or damp, rinse and allow to dry completely before reinstalling. Reassemble tank. Dirt Tank Assembly for Select SpinWave Spin Mops 1638725