It’s about this time of your outdoor fun that you realize your patio umbrella has some mold! You can easily lift it off by mixing 1 gallon of water, 1 cup of white vinegar, and 20 drops of tea tree oil in a bucket. Using a sponge, wipe down the umbrella. After a few minutes hose off the umbrella. The vinegar and tea tree oil will have attacked the mildew buildup, especially in the folds, and it should look like new!