Alright, so I decided to give my baby a thorough cleaning after replacing her felt oil drip pad (YUCK!). I got my usual dish soap, put a teeny bit on a wet paper towel, then wiped her down. When I wiped it off, there was a cloudy looking residue left behind. Panicking, I scrubbed at it more with the wet paper towel, then the dry. It began to wear off in little patches; it looks brown on the dry paper towel, and I can scrape it off with a finger nail. The finish seems to look fine underneath.
Have I completely ruined the machine's finish? Luckily this happened on the backside of the arm, so I won't see it all the time, but if it's something I need to clean off the poor thing I'd like to do that as soon as possible. Hope someone has had this happen to them!