Human: What is the best way to clean up after a septic tank backup? Assistant: 
The best way to clean up after a septic tank backup is to first turn off the water supply and then use a high-pressure hose to flush out the lines. You should also check for any signs of damage or blockage in the system, such as clogs, cracks, or debris. If necessary, you can also hire a professional to inspect and repair the system.