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Originally Posted by CleverButCheap
In order for hot water to kill any germs it would have to be boiling or mixed with bleach. Well, that's my opinion anyway! I have used cold water forever and have no problems. I also use liquid Tide. I'll say it again, bleach works just fine in cold water. Vinegar and baking soda do ok, but absolutely nothing makes a load of laundry any fresher than an old fashioned clothes line on a sunny day!
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Mites are killed in hot. Allergists are fairly adamant about washing sheets in hot for this reason. Other buggers, depends, what they are, what detergent you use, etc. Micellar properties of surfactants, etc.
I use cold for most things, but always a liquid detergent. In the days of powders, they would not dissolve well in cold, and I often redid loads with chunks of detergent on them. Ick.