Spouse and I have a discussion on what to do after you pour a sauce out of a glass bottle. I do nothing but my wife takes her finger and wipes the excess from the bottle before she puts the lid back on. I think touching the food is disgusting and she thinks leaving it there to gum up the lid is disgusting. What do people do?
Wiping with your finger introduces bacteria from your hands and is not a good idea from a food safety perspective. If you wipe the excess you should do it with a clean towel (like a disposable paper towel/napkin) or at a minimum wash your hands. It’s probably not a huge deal if the sauce is very acidic and the remainder will be used promptly but if it’s like a bottle of a condiment that may be used for weeks probably best practice to keep your grubby fingers out of there
You have an immune system for a reason. Hyper cleaning is worse for you as it weakens your immune system.