Bleach can be used for the same purposes as peroxide. There is a long thread on here about spraying a diluted bleach mixture as a fungicide. If you have more than a few plants, spraying peroxide can get expensive.
The best results I have gotten from peroxide came from using it on the black sooty mold that grows when I have a lot of aphids or whiteflies. It kills the mold immediately, without harming the plant.
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