We have a Marble counter with an under-mounted sink in our upstairs
bathroom. There is a small gap where the sink attaches to the countertop
and there is a reddish stain on the top of the sink that is visible in that
gap. I think it was something my daughter was using. It's a mystery.
I tried using a toothbrush and comet but it didn't come off.
I know the marble etches easily but since this is the underside I can use
something stronger as long as I'm careful not to splash it up on top of the
Are there any other cleaning products you would recommend to try and get
some of that gunk off?
First of all, it is highly unlikely that the sink is marble; most likely it
is faux marble made of polyester resin or china. Does it look like marble
or is it china?
I also kind of doubt that your daughter is culpable; about all the gals use
that is reddish is lipstick and rouge and she would have to intend to put
those there. On the off chance that is what it is, any grease solvent like
paint thinner should dissolve it.
Most likely it is rust from iron rich water that has been repeatedly
splashed there and then evaporates. If that is the case, rust removers like
CLR should work.
If those don't work, you could physically abrade it - marble or faux marble
or china - but you'd have to use something more abrasive than Comet...fine,
powdered pumice made into a paste would work, so would fine wet or dry
paper. If you have to abrade it, the surace gloss will be removed. It
could be repolished with a Dremel type tool equipped with a small cloth
wheel charfed with a polishing compound. If china, it would be much more
difficult to re-polish unless the material used to abrade was quite fine