Simple Solution Extreme Stain + Odor Remover (gallon refill) is 3x stronger* (vs. Simple Solution Stain + Odor) to eliminate tough dog stains and odors faster. Extreme Stain + Odor Remover has a professional strength formula that contains Pro-Bacteria* and enzymes that completely breaks down organic residue, permanently eliminating stains and odors, and discourages both dogs and cats from repeat marking the area. Safe to use carpet, upholstery, or other water-safe surfaces in your home to remove urine, feces, and vomit. Safe to use around children and pets when used as directed.