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I would have selected a granite in the first place. A true granite is not acid sensitive. This is something that should be tested in the home before the purchase and installation of your stone. Most people only select stones by their colors and don't think about durability or where it is going.

It sounds as if you have either over processed city water or hard water. I would have your marble honed because every time you have it re-polished the water spots (etching) will only keep happening again and if the stone is honed you don't see this happening.

Sealers can only protect you from staining - like the one being created by the soap bottle you described - which can be polticed out. Sealer will not protect you from etching. The honing process will remove the existing etching. A good stone cleaner - like Lustro italiano will help protect you and remove any soap scum build-up.

Call a reputable stone restoration professional (you may find one in our directory) to remove the stain and hone you up and you should be good for a long time.