Money-laundering

[Becky]

Where a clothes-washing-service employee intentionally adds a really [muddy]/greasy garment or towel to your merely-lightly-soiled laundry, causing the entire load to not get sufficiently cleaned when washed the first time, and therefore obliging the worker to throw said wash back into the machine for another full laundering-cycle, which of course you end up getting charged for, and thus [the establishment] dishonestly makes [extra money] that way.