Old bath tub blue stain?

';I have an old bathtub with blue stains around the drain and on much of the drain end of the tub. Even straight bleach does not work. Any suggestions? the tub is great and we do not want to replace it.Old bath tub blue stain?
We just finished re-surfacing our tub. We had the same thought- it was in great shape, just ugly. We bought a kit at Home Depot called Klenk's. It cost about $30 and if you follow the directions it is perfect. But you have to follow the directions exactly, which isn't hard. Our tub turned out nicely, and it looks like we bought a brand new one. It can also be tinted (the enamel) and you can buy it in white and almond colors. Not bad- brand new tub for $30?!Old bath tub blue stain?
Might try WD40. If that does not work try vinegar %26amp; baking soda together.


Also when you get it cleaned after each bath try rinsing the tub down and wipe it dry.