stained marble

natural method for removing the stained from marble:

1) baking soda + water => baking soda paste

2) 1 part of salt + 4 parts of cornstarch + water => salt-cornstarch paste

apply on the affected area, leave for overnight until it's completely dried, the stained can be removed.

i tried both, and i think the cornstarch works better, but it works on mild stained only!