lemon citrus stain on travertine

    I have 5 kitchen counter top travertine tiles that have white patches from lemon juice and need to remove stains. Do I use some poultice to extract the stain like Stain Removal Guide: For Stone, Tile, and Concrete) Fred M. Hueston or wet sand it then seal it. This is more expensive wanted to know if there are any tricks to this. I have read some contradicting reviews of what to use. the stains are about 3 weeks old and the tiles were never sealed they are rough not smooth polished.