How to fix a discolored spot on a stainless steel sink
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Have you tried a stainless steel cleaner such as Bar Keepers Friend?
http://homeguides.sfgate.com/descale-stainless-sink-31919.html
How to Descale a Stainless Sink
Stainless steel sinks are fairly durable, but they can be scratched.
The minerals in hard water can accumulate on your stainless steel sink, leaving ugly white or gray scale deposits. Scouring and abrasive cleaners can scratch stainless steel, so don't try to scrub the deposits off the metal. Instead, dissolve them with the natural acids in vinegar. If the vinegar isn't sufficient, baking soda is a mildly abrasive cleaner that can scrub off any lingering scale without etching the sink. Once you've removed the deposits, clean your sink regularly and dry it after each use to prevent the scale from accumulating again.
1 Saturate paper towels with distilled white vinegar. Lay the towels over the scale in the sink. Let them sit for at least 30 minutes. Add more vinegar if necessary to stop them from drying out. Remove the paper towels.
2 Rub the scale deposits with a nylon dish pad. Remove as much of the scale as you can. Rinse the area with a wet sponge.
3 Mix 1/4 cup of baking soda with 1 tablespoon of liquid detergent if scale remains. Slowly add vinegar to the mixture until it forms a paste. Apply the paste to the scale and let it sit for several minutes. Scrub the area gently with the nylon dish pad.
4 Rinse the baking soda mixture off the sink with a wet sponge. Dry the stainless steel thoroughly with a clean cloth.
Things You Will Need
White vinegar
Paper towels
White nylon dish pad
Sponge
1/4 cup baking soda
1 tablespoon liquid detergent (I prefer blue Dawn)
Clean cloth
Tip
Commercial de-scaling products are also available. Follow the manufacturer's instructions carefully if you use them.
Warning
Don't scrub stainless steel with abrasive cleaners or brushes as this can damage the finish.