Everything shrinks in cold, and expands in warm, is a think that is generally accepted as the way most things work.
It also depends on what material you are washing and what temps.
Not only that, but you should do a max warmth wash, empty or not, once a week or once a month, cause when was the last time you washed your washing machine? Warm water is probably the best way outside of actually hiring someone to clean it for you, by opening it up.
So, warm water is great for any oily residue, such as sweat, and sweaty clothes ya wanna wash at warm, as well as underwear, towels, bedding, since like i said, it removes oils and shit better, as well as killing germs and bacteria thanks to heat
But warm water can shrink some fabrics if its too warm, wool being a classic, which is funny cause many woolen articles does not need washing, at least not often, or without it being actually soiled or dirty in someway, since its self cleaning to a degree.
White cotton you allgedly should wash, I am not sure, since I do not own any white articles of clothing, I know colors are said to fade, but thats not true since clothing is dyed in a different manner, heck washing red and whites does not give you pinks, trust me I tried, and was very disapointed I had to buy a red dying solution in the end.
As for cold washing, well its cheaper, and you dont need to warm up water, so you can claim to be greener, even thought it has no practical effect, and i guess clothes dont shrink. Like, its fine for say you change clothes every day, never wear anythingg for more then 24 hours at a ttime, most of it will be low levels of sweat, and skin residue, which is easy to clean, uh certain frabircs like lace and silk are supposedly preferable to use cold wash with.
Like, this is kinda anecdotal, but much of what we know is based on anecdotal evidence really, great grandma who hand washed clothes for 60 years knows more about clothes then some fancysmancy washing machine vendor.
As for the towel thing, I am not sure, since towels are seen as dirty, they was usually washed at max temperature,.
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