Following a major sewer backup, the best disinfectant to sanitize hard non-porous surfaces is a solution of household chlorine bleach mixed with water (typically one cup of bleach per gallon of water) or a registered EPA-approved phenolic or quaternary disinfectant cleaner. These powerful chemical solutions effectively kill harmful pathogenic bacteria, viruses, and parasites found in raw sewage. Callout type="warning" title="Hygiene Warning": Wear heavy rubber gloves, boots, and safety goggles when cleaning up raw sewage contamination. Verification: Ensure the area is fully ventilated and scrub all contaminated hard surfaces thoroughly.
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