It depends on the type of growth and the intensity of the contamination. If it’s a new growth or a small amount of staining you can see results within days. Otherwise, it may take 2-3 months to see improvement. In the very worst case scenario, where contamination is extreme, it may take 6-12 months to work. Green stains on fencing and walkways tend to clean-up quicker than black stains on roofs or concrete. You can re-apply another application 1 month after the first application to speed up the process.
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