Remember the machine ran and then slowed down? I took the balance wheel off and looked inside. I was very technical and put an old sock over a screwdriver end and stuck it in the gear area--it came away with a thick gooey brown glob of grease. No wonder it slowed down. Gear cleaning tomorrow.
People have different opinions on what to clean sewing machines with. Many use kerosene and/or metal polish. I read one site that said sewing machine oil was safe to clean the easier jobs with--it works for me. I would stay away from WD-40, but that's my opinion. Also be careful of household cleaners. 409 apparently cleans some of the metal, but I'm not going to use it. Check out the sites on my previous post--those people know more about it than me.
Here's a download for sewing machine maintenance. It's for handcrank machines so it's a little different in some areas, but the basics are the same.