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Kitchen Sink
Even though it comes in contact with hot water and soap multiple times daily, your kitchen sink is probably crawling with bacteria—perhaps even more than you'd find on the toilets of public bathrooms, which may be regularly scrubbed with powerful disinfectants. A recent study by NSF International, a nonprofit organization that develops public health standards, found that because of the frequent contact they have with food, kitchen sinks are 100,000 times more contaminated than bathroom sinks. Scrub the entire surface of yours down once or twice a week with hot water and soap, making sure to remove every trace of coffee grinds, scrambled eggs or whatever else you see.