Wow, check out how gross my sewing machine is! Well, this is not actually a picture of mine, but mine probably looks pretty similar to this ... except mine is an 8-year-old $49 Singer from Wal-Mart and this is a luxurious, gorgeous, wonderful Bernina, which I can't afford. But, I dream of having a Bernina and I was disappointed to discover that not even Berninas clean themselves - bummer! But, regardless of what make the sewing machine is, I hear it'll run way more smoothly if it's clean.
Here's a very helpful post from the Bernina Blog on how to clean your sewing machine. In addition to learning how to clean my machine, I also learned some sewing machine part terminology that I didn't know before. So, thanks, Bernina!
[Thanks also to @VictorianaQuilt for the original link on Twitter!]