Answer: The pressure washer jet of water should remove debris, dirt, scaling paint and mildew from your siding without the addition of chemicals. I have used Simple Green in my pressure washer to remove moss and clean the siding of my house and it didn't harm the plants. You may want to cover the plants with old sheets if you need to work close to the leaves (such as your hosta) just to keep the strong jet of water from shredding the leaves. Use a mild solution of Simple Green (as directed on the label) and everything should be fine. Good luck with your project!
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