To get the dirt on dining out, ABC News Consumer Correspondent Elisabeth Leamy went undercover at 10 restaurants in three states. She took swab samples from 10 surfaces representing just about every surface you come in contact with at a restaurant. Then Dr. Philip Tierno and his team at the New York University Microbiology Department lab tested the samples. The results may surprise you. Visible goop didn't always translate into bad bugs, and some spotless surfaces harbored major microbes. Watch the full story on "20/20: The Real Dish" Friday at 10 p.m. ET

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