Stain removal

[Gonnagetgoingreturnsagain]

I've got a top which has got tiny dots of yellow stain in the bottom half of it.

Have got some Vanish but is there anything else I could try that would help remove this?

What colour is the top? We have Tide pens which are pretty good but if it’s white then you can’t go wrong with hydrogen peroxide.

Have you tried hanging it in the sun?

It's black or navy blue and white stripes. I\ve never heard of Tide pens before.

Not much sunshine to put it in either, been raining a bit.