My kitchen work surface is developing nasty yellow stains in places. Some
are getting quite big and seem to be spreading at will!

The stains wont come off. I have tried bleach, multi surface cleaner,
scrubbing, rubbing - all sorts. In fact I am rubbing the surface off before
getting the stain out. it seems indelible.

I dont know what it is. At first I thought it was tea stains (!) but they
seem to be spreading and are now in places which I do  even use.

In fact every item I leave on the surface 9 cups, plates etc) seems to leave
an  un shiftable stain.

Anyone met a problem like this?
Sort of removing the whole of the work surface and replacing it - any
possible solutions? I dont really want to have to rip the kitchen apart
right now.

Can I paint or resurface it somehow
What might be best?

By the way , I ought to add it wasnt a *cheap* work surface , although it is
about ten years old now.

TIA.