Power washing, or pressure washing, is often done to strip paint from wooden walls or sidings in preparation for a painting job. This procedure can also remove dirt, mold, and mildew that might have accumulated on your home's exterior surfaces over the years. While power washing has a lot of benefits, Amy Rodriguez (in an article for homeguides.sfgate.com) reports that a possible downside is the destruction of plants through exposure to power-wash chemicals. The most common cleaning agents used in power washing are bleach solutions and detergents. Bleach solutions can turn into salts, while detergents can cause brown spotting, both of which can kill plants. On the other hand, some reputable pressure washing companies like Renew Crew have formulated their own proprietary solvents which they guarantee to be safe for plants.
http://outdoor-surface-cleaning.com/2013/10/07/how-the-right-professional-pressure-washing-company-can-preserve-and-protect-your-garden-plants/
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