I have never tried this method; however, I know some people that have. I would imagine baking soda would probably leave a slight film which is not ideal on high gloss. I wouldn't use baking soda neat, in a paste or poultice, as this could take the surface shine off the glossy finish. A diluted vinegar solution may work well on the tiles to prevent streaking, but the acidity may cause a problem and damage the surface of the glossy porcelain tiles over time.