Degreaser for concrete When looking for an effective degreaser for concrete, you have several highly recommended options: 1. ACT Concrete Cleaner: This eco-friendly, USDA-certified cleaner uses enzymes to break down and bioremediate petroleum hydrocarbons and proteins, effectively removing oil, grease, antifreeze, gum, and other tough stains from concrete. It's suitable for both indoor and outdoor use but takes about 3 to 4 weeks to show full results​ (Bob Vila)​​ (Garage Transformed)​. 2. Simple Green Oxy Solve Total Outdoor Cleaner: Ideal for pressure washing, this biodegradable cleaner uses peroxide to remove dirt, grime, mold, mildew, moss, and algae from concrete surfaces. It is recognized by the EPA’s Safer Choice Program and can be used safely around pets and plants​ (Bob Vila)​. 3. CAF Outdoor Cleaning Eximo Waterless Concrete Cleaner: This microbial cleaner breaks down hydrocarbon chains in oil, grease, and petroleum-based stains, working on a microscopic level. It's natural, eco-friendly, and effective for both new and old stains but requires patience as it works over time​ (Garage Tooled)​.