Dirty sink help!

[Hellokitty105]

Desperate for help!

I had a new sink put in my kitchen and I made the mistake of washing decoding paint brushes in my new sink and now it’s stained with marks that won’t come off. When I put bleach in the sink some of the marks turn black after a period of time.

I have tried using vinegar and baking soda, cif, pink stuff and white spirits with no luck. What will make these marks shift for good? Nothing seems to be getting rid. I thought it might just come off eventually but it hasn’t and it makes my sink permanently look dirty.

see pictures.

Decorating paint brushes**

You could try Bar Keepers Friend or Nanna’s Secret. Both have worked for me to get various stains off our sinks including paint.

What about silver cleaner?

Thanks I’ll try those suggestions.
Google says not to use silver cleaner on stainless steel so not sure about that one.