Inside of your purse
Think of all of the germy things that go in your purse, like your phone, wallet, and other items you put on public surfaces multiple times a day. You may have some used tissues in there and open snacks, am I right? If your purse has a water-resistant liner, turn it inside out, and run an antibacterial wipe over it from time to time. If you have a lot of crumbs, you can also put the fabric brush extension of your vacuum in there.