Repairing Scratches on White Ceramic kitchen sink

[skhudy]

I have a ceramic kitchen sink, over the last year it has accumulated quite a few small scratches, which can be cleaned but quickly get dirty again.
I see a few repair kits available, are there any which have been used by others and are recommended?

 

[foxhole]

Have used enamel repair paint [small bottle with brush] to touch up a shower base with good results.