<human>: Summarize the given text in a few sentences.

I had a party at my house last week. It was a lot of fun, and a couple friends got too drunk to drive home. One of them, who had gotten his pants wet in the hot tub, slept on this couch belonging to my roommate. The next day the couch had a big wet spot from his wet pants, so we just left it and assumed it would dry out.

It turns out the material doesn't dry out very well, so after a few days of staying over at my girlfriend's house, I got a call from the roommate saying that my friend had pissed the couch and it smelled rank and she wanted it replaced ASAP. I came back to the house, agreed to talk to my friend to see if he could replace it. Before I talked to him, I gave the couch a nice deep sniff to see if it was really that bad.

Now, I know what urine smells like. This wasn't it. This smelled exactly like a piece of fabric would after 3 days of being wet without drying. That smell your laundry gets in the washing machine if you don't dry it after a couple days. Kind of funky, the beginnings of mold.

Long story short, my roommate refuses to believe that it's not urine. I am getting the couch professionally cleaned anyways, but the roommate insists that they get the $500 that this cost, because they "absolutely will not own a couch that has been pissed on".

My girlfriend and I are moving in together in about a month, and definitely can't afford $500 to replace a couch that doesn't need replacing. The couch is going to be cleaned tomorrow, and that's the extent of what I'm willing to do. Is this fair?
<bot>: My wet friend slept on a couch, 3 days later it started to smell funny, roommate think it's piss but it is not.