Many external factors bring about spoilage of fresh milk or fresh juice when it is not stored in refrigerator for 2 or 3 days. The following are some of them.
1. Defective storage mechanisms
2. Temperature and humidity
3. Micro organisms
4. Insects or Pests
5. Rodents and birds
Fresh milk or juice has a brief shelf-life which gets spoiled as it is having microbes which are alive at room temperature. Microbes in the milk will be inactive if the temperature is above 60o C (Boiling) and below 5o C (Freezing)