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
I usually try to make up for it beforehand by pouring really carefully and trying to get it so none pours down the side of the opening, but if some does I usually just put the lid on and wipe any excess after that. Usually that does decent enough at keeping it clean until it's used up anyway.
I think OP's no wipe leads to a messy pour next time, as it just adds to the residual gloop that builds up at the opening each time.
Ms. OP's finger, no offense, is probably dirty, but the sugar and/or vinegar in the sauce, plus the dehumidification from the fridge should take care of that also.
Consider how long people leave condiments in the fridge under all sorts of circumstances and we're not living in fear of old ketchup and mustard. If it's an issue, a compromise of wiping it with a little piece of paper towel should resolve it for you guys.
If it’s hot sauce, I typically use a napkin to wipe away the residual amount that runs down the neck of the bottle. That’s the only condiment that seems to have that problem. I don’t think I’ve ever had ketchup, mustard, or bbq sauce leak from a bottle so badly that it required me to clean the bottle after using it.
Ultimately, it probably doesn't matter. Your wife may have a point, but it is completely negated by the fact she's introducing contaminants from her hand to the food. Using a clean item to remove the excess may be beneficial, especially if the liquid drying can make it hard to open. Again, all of this is splitting hairs if your food is generally stored correctly and nobody is at particular risk for food borne illness. You're at home, not serving others in a restaurant.
It's actually getting harder and harder to find condiments in glass. Everything is plastic with an "ez squeeze" spout that don't really have this problem anymore. But I would use a paper towel to keep the mouth clean because I don't want the gross shit coming off when using the sauce, nor do I want it gluing the cap to the bottle making it harder to open.
I don't wipe it unless it gets gummed up but honestly I've can't think of anything where this happens anymore. All of my condiments are either jars or squeeze bottles. I never wipe squeeze bottles and they never get gummed up. Jars only get wiped if they somehow got a bunch of stuff in the grooves, which is excessively rare.
That being said using a finger is nasty and I hope you guys don't serve guests from those bottles.