While cleaning the shower today with Lime Away (the water is very hard here) and after wiping it down, I thought I tossed the rag in the sink but it landed on my fairly new Carrera marble counter top. I didn't notice it for about 10 minutes. Now there is a giant blemish in the marble. I don't think there is anything that will take it out other than having the marble re-honed and who has the money for something like that. As much as I love the look of marble in the bath, I will never do that again. On its first week, I put my contact lens case on it and it left two perfect little circles etched in from the saline. As my mother always said, "we can't have anything nice"