Final answer:
Cold water is the gentlest and most energy-efficient setting for washing clothes, but it is not very effective at removing stains.
Step-by-step explanation:
The water temperature that is the gentlest and most energy-efficient setting, but not very effective for getting out stains is cold. When you wash clothes in cold water, you save energy by not needing to heat the water. However, cold water is not as effective in removing stains as warm or hot water. So if you have heavily stained clothes, a cold wash might not clean them as thoroughly.
Learn more about Water Temperature