You know, in one sense it's a great thing to want to be vigilant about avoiding all things with even a trace amount of alcohol in them. It does show that you're serious!
But realistically it is impossible to avoid such things, unless you hide in your home and never go out to a restaurant or eat at the home of a friend! I should mention that I've known people to do exactly this--hide!--and it seems to me that this is far more damaging to people's long term goal of being healthy than any trace amount of alcohol they might ingest.