It can make it impossible for you to be able to get the hot or cold air that you are looking for in your home.
For tougher stains sprinkle some baking soda over the area then rub down with the vinegar and water mix. http://Gpsstore.info/__media__/js/netsoltrademark.php?d=www.Maschintex.sk%2Findex.php%2F2-ostatne%2F15-dekoracie-2