I've only recently started brewing beer I'm just on my 2nd batch now, and my friend gave me a bag full of sodium metabisulfite to use as sanitizer. He told me to mix it up and put it in a spray bottle to spray and sanitize everything and anything I'm about to use to brew and to rinse after. He also told me to use the sodium metabisulfite water in the airlock. So i am wondering do you really need to rinse after wipeing anything down with this? Some say yes and some say no. Also what would happen if you accidentally got a small drop into your brew? I worry with having it in the air lock it might somehow bubble into the brew or like earlier when i pulled the airlock off (to top up the sanatizer water in it because it was low somehow) some of it may have splashed out of the airlock and into the hole on the top of my fermenting bucket (I think a small amount have gotten into my brew for sure). Any answers would be greatly appreciated!