I just wondered this today. When you a stain on a shirt or on your body, you have to really scrub to get it out. Just rinsing it with water wont remove the stain. So how do machine washer clean clothes so well without using any type of pressure?
I have seen stains come off from clothes, and its really impressive.
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Most soiling agents that clothes come in contact with (dirt, sweat/oils) will come off with detergent, water, and the mechanical action provided by the agitator (the reciprocating shaft in the center of the drum).
Whether or not a stain will be removed has more to do with what the stain is from and if it’s been allowed time to sit.
It’s unlikely you’ll see a machine remove cooking oil stains that have set in over an 8 hour shift in a kitchen. I have shirts with 15 year old grease stains still on them
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