I’ve been a “throw everything in and wash on cold” person forever, but I started to notice certain things such as towels that typically require hot or warm water didn’t feel right anymore. Once I switched back they came out feeling soft and fluffy as usual. Why does it matter?
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It depends on the detergent and/or fabric softener.
Some detergents (especially older brands, and powdered detergents) don’t dissolve as well in cold(er) water, so they can leave a residue.
Fabric softeners tend to be wax-based – they work by coating the fabric fibers in wax, basically. Wax also requires heat to melt/emulsify properly.
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