Brush or sweep sidewalks and patios instead of using water for cleaning
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.
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 (leaves for example), gather it up and put it into your compost or around your plants.