Mud and soil are grayish, brownish, reddish, or yellowish. They are absorbed and built-up types of stains that can contain soil with greases and oils, as well as clay and iron.
1. Brush or scrape off as much as possible.
2. Apply detergent solution, blot.
3. Apply ammonia solution, blot.
4. Apply vinegar solution, blot.
5. Rinse thoroughly with water, blot until dry.
6. If stain remains, apply a “paint oil and grease” remover and dry-cleaning solvent alternately, blot until dry.