I use Mother's Mag and Aluminum Polish for the silver parts and the Singer badge.
The GOJO is perfect for the tough grease underneath and the Murphy's is great for the top and will not destroy the decals. Do not use water, use sewing machine oil to wipe off the soap and shine up your machine.
You would not believe the fuzz/lint that was gunked up in the feed dogs and bobbin area.
Do you see the brown? It is tar from people smoking around it. Can you imagine what a smoker's lungs look like?
I also gave her a good oiling, I oiled the head all the moving parts on irons.