Home and Garden - What can I use to clean white garden furniture?

What can I use to clean white garden furniture?

pressure washer
If it is the resin chairs they make a cleaner for them but I just use Sp*c & Span in a bucket of hot water. Wet them brush with a scrub brush & the soap mixture then rinse off with a hose.
Try that Mr. Clean magic erasing sponge. It'll surprise you how well it works.
bleach water/rinse good afterwards
comet and a brillo pab work well on the white pvc furniture
You can use "clorox-clean-up" or a Mr. Clean Magic Eraser!
Depends upon what it's made of. Cast alum or iron, you can use Clorox and water and a brush. Pressure washer may also work if paint is on very well and not chipping. You may also try Jo-Max as it has a surfactant that helps it "stick" to the item so the bleach has time to clean it.

For wicker, I'd use a very mild bleach solution.

Of course, where I am, it's humid and mildew is always a problem. If it's just dirt, hose it off.
For wicker, I use scrubbing bubbles and then rinse really good with garden hose and make sure you set it somewhere that it can dry fast. You'll be suprised how well it works but you have to follow the directions on the can and let it set long enough because if you rinse it to soon it won't do any good.
Clorox bleach make a strong solution with water and wet every inch let it on overnight.
spray with neat vinegar and leave for a few mins then wash off.
I use Castro Super Clean . You find it in the automotive dept at Walmart in gallon bottles ..mix as needed. Works well on boats too.