Originally Posted by
abc123xyz
It mentioned the hair dryer followed by denatured alcohol. Hope this gives you some ideas.
I would highly discourage the use of alcohol on a 1930s Singer. It will mess up decals and finish of shellac on the machine. However, IIRC the alcohol is used with french polish, but that is a labor intensive and extreme caution needed to do it correctly.
Janey - Neat people never make the exciting discoveries I do.