An oil or grease stain on your suede shoes or boots can be removed following the simple procedures below. Oil and grease can be removed fairly easy from a leather or rubber shoe, but removing the stain from suede can be a little bit trickier.
Solution 1: CORNSTARCH = Make sure your shoes or boots are dry and add a large amount of cornstarch to cover the oil or grease stain completely. Leave the cornstarch on the stained area for 30 minutes. The cornstarch has excellent absorbing properties and will actually absorb most of the oil stain. Wipe it off with a wet cloth or run the shoe under a running faucet to remove the excess cornstarch. You can repeat this a few times until most of the stain has been removed. Once you have tried this you can also try solution 2 below.
Solution 2: DAWN DISH SOAP = Dawn dish soap is one of the only common soaps that actually breaks down and removes grease and oil. Put a large amount of the soap over the grease stain and make sure to give it time to start breaking down the oil. Leave it on for about 10 minutes. Use a soft scrubber brush to work it into the grease stain. Then wash it off with water and repeat as many times as necessary. Let the shoe or boot dry off and once dry the stain should be gone.