Stripes on carpet?
Answers: louiesid get the cause right, the root impose is differential air pressure contained by the rooms a way to mute the effect is to not close your doors, a good nouns filter will also help redusce the problem. Fortunately a apt carpet cleaner should know how to remove the stains, with for a time work, you might have to scrub at them but they should come out.
traffic of the foot, put a throw rug ,or use ancient Japanese custom of removing shoes befor entering
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