<human>:  How can I remove a coffee stain from my couch?
<bot>: One way to remove a coffee stain from a couch is to mix together one part dish detergent and four parts cold water in a bowl. Then, using a clean cloth, dip it in the solution and gently scrub the stain. If the stain is not completely gone, you can repeat the process with a stronger solution. After that, you can use a clean cloth to dry the area.