How do you remove a rust stain on granite countertop?

Metal (iron rust, copper, bronze) Iron or rust stains are orange to brown in color and follow the shape of the staining object. Copper and bronze stains appear as green or muddy-brown and result from the action of moisture on nearby embedded bronze, copper, or brass items. Metal stains must be removed with a poultice. ***** Begin by mixing the poultice (baking powder and hydrogen peroxide). You will want to create a thick paste. It should have the consistency of putty. Apply the mix to the stained area, keeping it only on the stain. The layer of paste should be about one fourth of an inch thick and overlap the stain about a half an inch. Cover the area with plastic wrap and tape the edges down. Allow it to set for 24 hours. Remove the tape and plastic wrap only, leaving the poultice in place. Allow this to remain on the stain until it is completely dry. When the paste is completely dry, use a plastic scraper to scrape away the paste. Wipe remaining paste away with a clean cloth. Clean the area as normal and dry with another clean cloth. If the stain remains, you may need to repeat steps 2-6 several times, especially for oily stains, each time removing more of the stain.

Soak a cotton rag with white vinegar, lay it on the stain then take a two day vacation! Just make sure to keep the rag soaked with the vinegar..... Just white cleaning vinegar..... It also takes mineral buildup off the faucetts etc...Just let it set overnight.