You should wash everything you cut through: avocados, melons, etc. Because the knife blade spreads germs into the innards as it cuts through. A banana is diffe

You should wash everything you cut through: avocados, melons, etc. Because the knife blade spreads germs into the innards as it cuts through. A banana is different. Unless you touch the fruit, the germs from the outer skin don't come in contact with it.