A friend of mine borrowed my Quick n Brite, I had bought off an info commercial more than 15 years ago. She was in awe of how well it worked. I've never seen it in stores but their web address is:
http://www.quicknbrite.com/
I have used it on my patio set to clean that up after winter. Everything comes out like new including the umbrella and cushions. I bought the set in 1988.
I use this every year to clean the outdoor furniture and things. It is safe for pets and humans and is biodegradeable.
Like I said I bought it over 15 years ago and am still using the same container. I bought the paste form and it goes a long way. I would definitely buy more when mine is gone!