Hot water breaks down oil barriers, which helps get odors and stains out of cloths.
However, the downside to this is that heat expands fabrics, which will mess up weaves/stichtings/etc. that hold clothes together, no to mention it could dillute the dyes that make up the color of the clothes.
So by default you probably want to use cold, unless you need the heat. Bedding and towels don’t matter to look as good as clothes, so some people just use heat all the time with those, but unless there is a specific stain or odor you’re trying to get out, I would use cold on everything else.
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