Philartphace / Getty Images
Mild: Warm water mixed with dishwashing detergent is an effective grease-cutter. Scrubbing with table salt provides a mild abrasive. Moderate: Dishwashing detergent, ammonia, and pumice step up the cleaning game. Ammonia is a stronger grease-cutter and pumice is a harsher abrasive. Strong: Thickly blackened chimney bricks may require cleaning with hot water and tri-sodium phosphate (TSP).
