That I'm on a first name basis with the Hispanic repair guy at my apartment complex? He's been here that many times.
Either way, I got a nice photo of what he was there for:
Edit: *I'm just going to link you to the photo*
HereThat would be lint from the dryer. There was so much of it (from the previous occupants) that the machine was partially filled, and the lint screen couldn't fit properly because it sat on top of the lint.