What is the best way to clean scuff marks on white Porcelain sinks?

Soft scrub and a magic eraser. This is how I do it when I clean homes that have porcelain sinks

Soft Scrub by Clorox

Comet

Barkeepers Friend is what I use.

Magic eraser

Soft scrub or Barkeeper's friend. In other words, a gentle abrasive cleaner, but NOT steel wool such as SOS Pads or Brillo Pads.

Magic Eraser!

I always use Comet

https://www.bing.com/search?q=What+is+the+best+way+to+clean+scuff+marks+on+white+Porcelain+sinks%3F&qs=n&form=QBLH&sp=-1&pq=&sc=8-0&sk=&cvid=BADC33954E3847C0837B78C25744D1EF

https://www.instructables.com/id/Avoiding-Chemicals-To-Clean-A-Porcelain-Sink/

*****I agree with Kelli! I use Soft Scrub the heavy duty kind. It is wonderful. I also put sink mats down on my porcelain sinks which helps protect them as well.

Baking soda and hydrogen peroxide rubbed in with a stiff sponge. I use Scrub Daddy with cold water. Most likely anything you do will only be a temporary solution and has to be reapplied frequently.

Magic eraser, dampened.

Comet and scrubby