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[This message has been edited by AngeloS (edited January 12, 2004).]
I have a similar yellow gunk that accumulates on my cold-water pipe that runs across my basement bathroom ceiling when I take a shower. Condensation sits there and a little mold or mildew grows, I think. From my painted steel pipes, it wipes right off.
For you, you'll want to be able to turn to regular bleach to remove mold or mildew if that is what it is. But bleach seems to remove most sealers. Once your grout is sealed, far less mold or mildew will grow since the grout won't actually get wet and will dry as fast as your ceramic tile.
There is an invisible and permanent sealer for your grout that can be cleaned with bleach without hurting the seal. A clever search will find it. If you have trouble finding it, let me know.