I'm just doing my manicure and gel polish course and the section about Sterilization it says that cidex, marvicide and formaldehyde are what is to be used for chemical sterilizing of equipment. But when I looked up cidex it said it had been stopped from sale and I've seen a lot of people say they use barbicide to sterilise but my course info says that's only a sanitizer? Can someone please help, I've no previous experience and really want to know what I need and some need to buy when I pass and get set up! Thank you!