21. Think about air vapor
There are different degrees of an allergic reaction. Some people will exhibit a response when they are present, while others need to digest it. You have to know at what level people enter your home to take all the necessary precautions.
One step to take is not to allow anyone with a specific food allergy to enter the kitchen area. Allergens in the air can always enter human systems and cause a reaction. You should also leave them out of the kitchen for at least 30 minutes after cleaning.