In my 15-91 adjusters manual Singer says to use kerosene to clean out darkened, thick oil or grease. If Singer say it's ok it must not hurt the machines at all.
Originally Posted by
J Miller
Nancy,
Here is a trick I've used on a couple machines that were really badly gummed up. Use Hoppe's #9 gun cleaning solvent.
It's mostly kerosene with some additional ingredients. It works very well for cleaning the yellow brown oil and nicotine off of the chrome parts. And limited contact won't hurt ..... as least it hasn't hurt any of mine .... the paint or decals.
I use it mostly to removed the old oil from the presser foot and needle bar.
Joe