Yep, they’re gross. We don’t really think about keys being dirty – but they definitely are. Your keys go everywhere with you, and they touch SO many less-than-sanitary surfaces throughout the day. Keys are given an ENORMOUS opportunity to collect bacteria. Although brass is known to be a naturally antibacterial substance, it’s not a bad idea at all to sanitize your key set with a disinfectant wipe, or scrub them with a little soap and water.