Removing an Oil Based Stain with the Rug Doctor Spot Remover. For oil based stains use the Rug Doctor Spot Remover Scoop up solids carefully. Remove excess liquid by gently blotting with a clean, absorbent cloth or paper towels. Using the Rug Doctor Spot Remover lightly spray a small amount onto the affected area without saturating. Gently agitate with a clean, damp cloth working from the edges towards center of the stain. Rinse and Repeat to remove product residue, followed by dabbing with a clean dry cloth or paper towels. Repeat if necessary. Always follow product instructions.