Question:
If someone peeled off the inside of a ketchup bottle with fleishig greasy hands, forgets to wipe off the inside of the bottle, and then at a later point accidentally uses it for dairy, would the fleishig grease be considered botul?
Answer:
Hello,
Understandably the bottle should be wiped off, but if it wasn't dairy food is permitted to eat. It is only a safek if the inside of the bottle actually got greasy from your fingers, and also as you write because the amo0unt of grease is negl8igible and botil.
Best wishes
