Brush or sweep sidewalks and patios instead of using water for cleaning
Why
Washing even a small section of sidewalk with a hose can use 200 or more litres of water. If you are using a pressure washer you are also using electricity and creating noise.
How
Most of the debris that is on your patio or sidewalk is organic, and can be swept onto your green spaces. If there is a lot of organic debris (e.g., leaves), gather it up and put it into your compost or around your plants.