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We need germs to have a healthy immune system.
All this anti bacterial crap and fear of germs is killing us.
Because bacteria thrives at room temperature....therefore washing clothes in hot water (above room temperature) means bacteria doesn't grow as well.
No, it doesn't sterilize clothes, it does help reduce the spread of disease.
If there is blood wash them in cold water anyway. Hot water will set the blood, cold water will wash it out.