How can I remove the housing on the SILENO pro, max & free models to clean the robotic lawnmower greenish?

Reach under the top cover with your fingertips and pull it up to remove it.

Push the clips outwards, which are located on the back of the case, and then lift the side of the case.

Now push the clips outwards, which are located on the front of the case, and then lift the side of the case.

Now pull the case up to detach it from the chassis.