1 Answer

Things You'll Need
Water
Liquid dish soap
Superfine steel wool
Cloth

Instructions
1
Plug your sink.

2
Fill the sink with hot water.

3
Add several drops of liquid dish soap to the water while the faucet is still running. Use the type of liquid dish soap that is meant to cut through grease.

4
Put the stainless steel pan into the soapy water.

5
Let the pan sit for at least one hour. This gives the soapy water time to penetrate and loosen the carbon stains and buildup.

6
Scrub the carbon stains with superfine steel wool. Do not use any tougher abrasives as these will likely scratch the surface of the pan.

7
Re-soak the pan for another hour if the carbon stains don't come off. Scrub the remaining carbon stains off.

8
Unplug the sink and let the water drain from it.

9
Rinse the stainless steel pan with warm water to remove the soap residue.

10
Dry the pan thoroughly to prevent watermarks or streaks from drying on it. 

http://www.ehow.com/how_7419370_remove-carbon-stainless-pans.html