Chefs who work in kitchens fight a constant battle against stains on their clothes from grease and oil. Deep fryers, saute skillets, and broiler pans are all vessels for oil that can splash onto clothes, including those Timberland boots you're wearing as nonslip safety shoes in the kitchen. Removing oil stains from Timberland boots can be done, but it may take a couple of tries.
Blot as much of the oil as you can immediately after the stain occurs. Avoid wiping, as this will spread the stain over a larger area.
Sprinkle a layer of either talcum powder or cornstarch over the entire stain. Allow the powder to sit on the stain overnight.
Gently wipe the powder residue away with a dry cloth. Repeat the process if necessary.
Rub more powder rapidly into the spot to create friction and heat on any of the stain that remains. Heat loosens the oil and helps the powder absorb it.
Spray a light coating of leather polish over the leather to help it regain its luster.