it is very hard to go through UK customs
No because Canadian flights to Mexico go north over the north pole and over South America not south over the USA, {Just Kidding} no you do not have to go threw US customs on a flight from Canada to Mexico or vise versa.
NO your answer here...
Declaring it as a firearm is the only sure way to pass it through customs.
No, imported mattresses do not have to go through customs because they are not considered a hazardous material.
to the airport
I had to go through customs at the airport
No. You will have to report to Canadian customs with a passport to enter Windsor, ON. You will also have to pay $3.75 USD to go to Canada.
You can go here to see a list of Canadian Food http://www.canadaonly.ca
lo
No, he does not exist, on the other hand, someone dressed like Santa would have to go through customs and he better have a passport.
Certain foods are allowed through US customs, but many are not. Unpackaged foods, raw meats, fruits, vegetable, produce, un-packaged breads, ect. are not allowed in. Certain food dyes that are legal in other countries are not always legal in the US, too.