Wrong off the bat. I have two charcoal mini Webber BBQs on my deck. I use both when people are over. As soon as I’m done with the grills I dump the grills in a pan of hot soapy water and later scrub them with a Brillo pad. In my youth I would use the filthy grills that are sometimes found in campgrounds. I figured that enough heat will kill anything dangerous. I lived through that, so. ..
I don't fuss with soap and water. Like others have said, at high temperatures, you are killing any germs and bacteria. Nearly a half century of grilling like this and I'm as healthy as can be.
Plus, meats taste better off a "seasoned" grill.