Woman cloth in laundry

A woman sends her clothing out to the laundry one a week.  When they come back she notices there are still stains on her knickers.
So next week she encloses a note to the laundry that says, "Please use more soap on knickers."
This goes on for several weeks, the woman sending the same note to the laundry.
Finally, fed up with the notes the laundry replies, "Please. Use more paper on arse!"
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