Check the expiration or sell-by date
Smell the milk for a sour or off odor
Look for clumps, curdling, or separation
Check for a lumpy or thick texture
Taste a tiny amount only if it looks and smells normal
Watch for an unusually yellow or discolored appearance
See if the container is swollen or leaking
Trust a bitter, sour, or unpleasant taste
Discard it if it has been left out too long
When in doubt, throw it out