After several failed attempts to get my umbrella clean, I picked up this 30 Seconds Cleaner to try before giving up.
It easily attaches to your garden hose and has two settings. One for cleaning and one for rinsing.
I gave the patio umbrella a good soaking with the cleaner for several minutes.
Much to my total shock and amazement, it worked VERY well! Look at the difference when I was half done.
I didn't even realize HOW dirty the umbrella actually was until I used this cleaner on it. It came out so clean it looks brand new!
It worked so well, I also cleaned my patio cushions with it. They came out cleaner than when I wash them in the washing machine!
The bottle says this product can also be used on siding, fences and decks and that it won't harm your landscaping.