The surface of milk is a great environment for growing many types of airborne bacteria and fungus. Milk provides three things that bacteria need to grow on: 1) water 2) protein 3) carbohydrates All of these are provided in solution on the milk. The growth of many bacteria and fungus is slower at lower temperatures. This is why we refrigerate and freeze food in order to make it last longer. As the temperature increases, bacteria will grow faster. So milk will “mold” (bad choice of words) at room temperature faster than when refrigerated because the bacteria will grow faster at room temp.
I recently moved into a newly rented apartment and found signs of mold. Frankly, it worries me terribly, because I’m allergic, and it can lead to bad consequences. I decided to immediately turn to specialists who provide mold remediation services. I really enjoyed working with them because they removed the mold quickly and very well.