Do Toxic Chemicals Permeate Milk Cartons

I have noticed that certain small grocery stores in our area tend to have a very heavy cleaner/deodorant smell. We popped into one this evening for a quick carton of milk, and when I got in the car I realized that the carton had the odor of the store - and the odor even transferred to my hand after I carried it to the car. Is it possible that the chemicals permeated the milk carton and contaminated the milk, or are paper milk cartons sealed well enough to prevent that?