This question isn't really specific to any one brand of insulin, so I'm posting it in the Main Forum (hope that's okay!) After you withdrawl the syringe needle from the vial of liquid insulin, do you wipe the top of the glass bottle with an alcohol swab, before putting it back in the fridge? Like right on that round rubber "lid" of the glass bottle? I've heard that the reason they say to throw out unused Vetsulin (for example) after 42 days, is because of the risk of bacteria forming somehow. So I thought if I wipe the outside of the rubber lid with an alcohol swab every few days or so, that might help? But I called the manufacturer of Vetsulin (Merck Pharmaceuticals) yesterday and they that said some people do that, but they can't officially recommend it because alcohol can possibly interact with the delicate insulin chemicals somehow. So I wanted to see how many people respond to this thread with either "yes" you do this, or "no" you don't think it's a good idea...? Please share your opinion - the more people that reply the better!