When it gets cold outside, we get colds inside. We also get the flu. And RSV. And — lately — norovirus. We all know that washing our hands helps defend against illness. But with what? There’s too many kinds of soap, and not all of them will keep you healthy in every situation. Should you up the ante with antibacterial or does bar soap set the bar? This week on Explain It to Me, host Jonquilyn…