They're not that hard to clean up, mostly just oiling and such. I have a 1917 White Rotary treadle, my absolute favorite machine out of the herd. Don't use any harsh cleaners, you'll quickly remove and/or silver the decals. I use sewing machine oil(SMO) to clean my machines, use a light touch and soft t-shirt scraps.
Here's my machine,her name is Suzie Rose, my friend's dad is repairing the drawer for me.
https://www.flickr.com/photos/391684...7637458806455/
Sharon in Texas