Jim,
Here are some pics of mine:
(Just happened to have the thumb drive stuck in the machine
)
[ATTACH=CONFIG]470678[/ATTACH]
Kenmore 117-720
[ATTACH=CONFIG]470680[/ATTACH]
Kenmore 117-812
[ATTACH=CONFIG]470681[/ATTACH]
Singer 66-18 ( Have two, had three.)
[ATTACH=CONFIG]470682[/ATTACH]
White Dressmaster 127
~~ AND ~~
Here is a before and after of a Singer 66-18 that the crinkle paint was cleaned with only SM oil and cotton balls / pads.
Before:
[ATTACH=CONFIG]470690[/ATTACH]
After:
[ATTACH=CONFIG]470691[/ATTACH]
So, IMNSHO detergents, foaming or otherwise isn't needed. I'll stick with the SM oil.
Joe