Milk test: Testing milk for possible detergent adulteration at home is relatively simple. By vigorously shaking a small sample of milk, you can observe the foam that forms. Excessive or persistent bubbling may indicate the possible presence of detergent, as detergents contain surfactants that can increase foam stability. To reduce the risk of adulteration, always buy milk from trusted suppliers and check the packaging and labels carefully. However, a home test can only serve as a preliminary check; laboratory testing is the most reliable way to confirm milk adulteration.