Clean outdoor light fixtures are more attractive and provide more light than those that are neglected or forgotten at cleaning time. For best performance, outdoor fixtures should be cleaned twice a year. It's not difficult to do and doesn't require special equipment. It does, however, require some time and a bit of care careful attention so water does not come in contact with any electrical sockets.
Check all the light switches and make sure they are turned off. Turn off the circuit breaker that controls the light as well.
Secure a ladder near light fixtures you cannot reach from the ground.
Remove any globes, shields or grills with an appropriate tool (most likely a screwdriver); then unscrew and remove the light bulbs. Set all parts aside.
Fill two large buckets with hot water and add dish soap. Agitate the water to create suds.
Place the globe, shield or grill you removed earlier in one of the buckets.
Saturate a rag or sponge with sudsy water from the second bucket, and use it to wipe down the parts of the light fixture that you cannot remove. Wok carefully, keeping water from running into open sockets.
Rinse the fixed pieces with water. Remove the loosened pieces from their bucket, wipe them down and rinse them as well.
Apply polish or wax to metal parts when they are dry, if desired. Use glass cleaner to clean glass globes or shades.
Wipe off light bulbs or tubes with a damp rag, being careful not to get the end that screws into the socket wet. Reinstall the light bulbs and reassemble the light fixtures. Turn the circuit breaker and light switches back on after the light has been reassembled and thoroughly dried.