Human: How to clean the septic tank? Assistant: 
The first step in cleaning a septic tank is to remove all solids and debris from the tank. This can be done by using a vacuum or a siphon pump. Once the tank is cleaned, it should be pumped out with a septic tank pump. After that, the tank should be scrubbed down with a high-pressure hose to remove any remaining debris. Finally, the tank should be rinsed with water and left to dry before refilling it with new waste.