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[CherryHugs]

The good thing is it is not a big area but its stubborn lol.

[faeriemoon]

Is the sink porcelain or stainless steel (or something else)?

[CANDLEQUEEN]

Bar Keepers Friend or The Pink Stuff. Both work really well for me....

[SilleeMee]

Pumice powder, medium grit. You can add it to any kind of cleaner to give it scrubbing power. A little bit is all you need. I buy mine from Amazon. Pumice powder will not scratch glass, ceramic or porcelain. Rinses of easily and leaves no gritty film.

[RedTop]

I would fill the sink with white vinegar and let it sit overnight.   

@CherryHugs 

By chance is this a vinyl or fiberglass sink?

[Mindy D]

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@We rescue cats wrote:

Two things I go to for hard jobs:  GP66 and Bio Cleaner, I buy both from QVC. I'm assuming you've tried Kaboom and/or Scrubbing Bubbles? Those normally take care of soap scum issues for me.

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@We rescue cats They changed the formula for Scruubing Bubbles. If you haven't bought new you're in for a surprise. It's not as good as it was. 

[CherryHugs]

@RedTop  No it is just a regular bathroom sink

[RedTop]

@CherryHugs 

Regular as in porcelain?

[Desert Lily]

 @CherryHugs  Could it be a residue from hard water and not soap scum? Or, could the finish of the sink have been compromised from hard water or a cleaner, whether it's soap scum or hard water residue?

[RedTop]

@Desert Lily 

I agree.  The issue does not sound like soap scum, sounds more like damage to the surface of the sink.