I have a kenmore dishwasher. I noticed that the air vent which is on the inside , on the top part of the door is packed with goop. How did the goop get in their, if it's an air vent. My manual does not explain anything about cleaning the vent or what to do with the vent.

That doesn't sound right. I have a new Kenmore and goop was not an option for my model. I would call the store you bought it from.