Enzymes in Bio powder are basically tiny living things that break down stains. They’re not cruel; they’re just hungry. The enzymes don’t stop working when the wash cycle ends—they keep munching until they’re rinsed away.
That’s why some people say Bio left in the drum can cause a bit of a smell if you leave wet clothes in too long. Lesson: Take your clothes out promptly. Your gym socks don’t need a second fermentation.
Non-Bio has no such drama. It’s the low-maintenance friend who never complains. It just gets on with the job, quietly and calmly.