The only one that is effective is the same one I used when I worked at a vet clinic and that is rubbing alcohol and hydrogen peroxide. Both are safer and more effective against a lot bacteria, viruses, parasites and general germs. The only down side is that they are drying to use on skin several times a day.
I am very pro-holistic care when it is done right. While vitamin C, fresh air, and good sleep is enough for most people others who are on loads of medication and have compromised immune systems will need extra care with a medical doctor. That is the trouble with this kind of stuff. Not everyone is the same height, weight, age, eating the same diet, doing the same exercise, sleeping the same amount, or taking to same meds. You can't treat people as a collective unit, you have to focus on individual needs and I hope people in both mainstream medicine and holistic care realize this as well as every day people reading stuff on Facebook.
My own mother is in such a panic she is convinced that if she gets this virus she will die. I hardly ever see her sick and she has a better immune system, all things considered, than a lot of people half her age. There is no talking to someone though when they are in a constant state of fear.