My aunt's suggestion to try X-14 was foiled by the fact that the stuff isn't available in Virginia. I don't know why that is, but that options came off my list. I used a bleach pen a few times on the very bottom of the wall (where it hits the tub, so there was no chance of it connecting with the marble), but that didn't work.
At one point, I was walking by the local eco store and decided to pick up an "all natural" mildew product. I was a little worried that reviews of the product on Amazon were negative, but decided to give it a shot. The reviews focused on the product not being all natural. That really didn't concern me. I wanted it to work. I wanted my marble to be okay. On it went.
The marble wound up being just fine. The grout in some areas wound up looking minty green (this after I was assured the green color would not affect the tile or grout). To say I freaked out would be an understatement. I rinsed the eco product off and then threw together an OxyClean poultice and slathered it on the grout with a plastic knife, hoping it would pull the green off. Thank goodness, it worked.
But I had a new problem. A few of my tiles started to look funny as I rinsed the OxyClean off. Now, the OxyClean solution was suggested by major tile gurus on the tile forums (John Bridge being the ultimate stop for tile information). OxyClean isn't ph neutral, but when mixed with water, the tile experts said it was safe for super sensitive marble.
I presented my pictures to the forums and most over the homeowners couldn't spot what had happened. The tile experts did, of course. One of those gurus said that while he always suggests OxyClean, he suggests that it be mixed at half strength. Amazingly, it was his specific posts that led me to OxyClean in the first place and he had never mentioned a concentration before.
I was so sad. Other forum members and even Marc said that only I was noticing the damage and that in time, I wouldn't see it anymore. I'm not so sure of that. The bathroom was my first renovation project. I saved for months to do it and carefully gathered the materials over the course of many months. I don't know if I'll be able to over look my damaged tiles.
So...do you see the damage in these pictures?