Cleaning cloths collect grease, chemical residue, bathroom grime, and tiny bits of whatever they wipe. If you throw them in with regular clothes, oils and cleaning products can spread into your everyday laundry, and delicate fabrics may pick up unwanted smells or residue.
Washing them separately means you can use hotter water or stronger detergents without worrying about your favourite t-shirts. Grease and product build-up gets washed out more thoroughly, so the cloths stay absorbent.
If they’re not cleaned properly, they start to just smear dirt instead of picking it up. Separate washes keep them truly functional instead of turning them into fancy-coloured rags.