Outdoor furniture is designed to take a beating from the weather. Most common are plastic, wood or metal.
Tools & chemicals:
Water hose, bucket multi purpose or specialized chemical, cleaning cloths or soft brush.
Technique: A regular hosing is an effective way to clean outdoor furniture. Be sure if you have any seat cushions they are the all-weather type that can be sprayed (most are). Try using a mixture of dish soap (use one ounce per gallon of water) and pre-spray your plastic, aluminum and even wood furniture, then spray off with a garden hose.
If dirt persists, scrub with a brush after pre-spraying.
Do not use abrasive cleaners or cleaning tools.