Oil, grease, and automotive fluids penetrate concrete quickly and create stubborn stains that block sealers from bonding and make floors look permanently damaged. A quality concrete degreaser breaks down these hydrocarbons at the surface and within the pores, making rinsing and scrubbing effective. The five products below range from heavy-duty industrial formulas to eco-friendly biodegradable options suited to different stain levels and safety requirements.
| Product | Best For | Rating |
|---|---|---|
| Simple Green Pro HD | General degreasing | 4.7/5 |
| Oil Eater Original Cleaner | Heavy oil stains | 4.6/5 |
| Zep Heavy-Duty Citrus Degreaser | Citrus-based cleaning | 4.5/5 |
| Krud Kutter Concrete Cleaner | Pre-seal prep | 4.6/5 |
| Purple Power Industrial Degreaser | Budget heavy duty | 4.4/5 |
Simple Green Pro HD — Best All-Purpose Concrete Degreaser
Simple Green Pro HD is a water-based, non-corrosive degreaser safe for use on concrete, brick, and masonry. It is biodegradable and free of harsh solvents, making it appropriate for garages with floor drains, areas near vegetation, or applications where airborne fumes are a concern. At full concentration it handles moderate grease and automotive fluid stains effectively. For heavy engine oil stains, let it dwell for 10 to 15 minutes before scrubbing with a stiff brush. The concentrate formula is economical — dilute up to 1:10 for general cleaning. Wide availability in hardware stores is a practical bonus.
Oil Eater Original Cleaner and Degreaser — Best for Heavy Oil
Oil Eater is a commercial-strength water-based degreaser formulated specifically for petroleum-based stains. The alkaline formula emulsifies engine oil, transmission fluid, and grease at the surface and in the pores of concrete. Applied at full strength on a fresh spill, it absorbs and lifts the oil in minutes. On older set-in stains, dwell time of 20 to 30 minutes combined with hot water and scrubbing produces good results. It is safe on most surfaces including concrete, asphalt, and metal. The gallon jug offers strong value for anyone dealing with a consistently oily garage floor or parking area.
Zep Heavy-Duty Citrus Degreaser — Best Citrus-Based Option
Zep’s citrus degreaser uses d-limonene — a natural citrus solvent — to cut through grease without the harsh fumes of petroleum solvents. It is effective on cooking oils, automotive grease, and general surface grime on concrete. The citrus scent makes it more pleasant to use than industrial chemical degreasers in enclosed spaces, though ventilation is still recommended. It comes ready-to-use in a spray bottle for targeted application. Coverage is lower than a concentrate product, so for large surface areas a concentrate refill option is more economical. A good choice for kitchens, patios, and residential garages.
Krud Kutter Concrete Cleaner and Degreaser — Best Pre-Seal Prep
Krud Kutter formulates this product specifically for concrete surfaces that are being prepared for sealer, epoxy coating, or paint. The non-acidic, water-based formula removes oil, grease, rust, and mineral deposits without etching or damaging the surface texture. This matters because some aggressive degreasers can alter the pH of the surface or leave residue that interferes with coating adhesion. It rinses clean without leaving films. Many epoxy floor kit manufacturers specifically recommend pH-neutral degreasers before coating application, and Krud Kutter fits that requirement well at a reasonable price.
Purple Power Industrial Strength Degreaser — Best Budget Pick
Purple Power is a widely available, low-cost degreaser that handles a broad range of petroleum stains on concrete. The alkaline formula works well on engine grease, motor oil, and general shop floor grime. It is available in large containers at most auto parts stores and hardware chains, making it easy to keep on hand for regular maintenance cleaning. It is more aggressive than biodegradable options, so use gloves and keep it away from painted surfaces and vegetation. For straightforward garage floor maintenance on a budget, Purple Power delivers consistent results.
How to Choose a Concrete Degreaser
Match the formula to the stain type and location. For fresh petroleum spills, any of these products works when applied quickly. For old, set-in oil stains, choose a heavy-duty alkaline product like Oil Eater or Purple Power and plan for multiple applications. For surfaces being prepped for sealer or coating, use a pH-neutral cleaner like Krud Kutter to avoid surface contamination. Consider environmental constraints: near drains or gardens, a biodegradable formula is the responsible choice. Always test a small inconspicuous area when using a new product on decorative or sealed concrete.
Once the surface is clean, proper sealing is the next step — see our guide at /articles/best-concrete-cure-and-seal for top sealer picks. If cracks need attention before sealing, our /articles/best-concrete-crack-repair guide covers the best repair products. Learn more about how we test at /methodology.
Frequently asked questions
Do I need to pressure wash after using a concrete degreaser?+
Yes, rinsing thoroughly after degreasing is essential. Most degreasers need agitation with a stiff brush followed by a pressure wash or strong hose rinse to lift emulsified oil from the concrete pores. Leaving degreaser residue on the surface can prevent sealers or coatings from bonding correctly. For heavy stains, a second application and scrub may be needed before the final rinse.
Can a concrete degreaser damage plants or grass?+
Many heavy-duty degreasers contain alkaline or solvent-based compounds that can harm vegetation if they run off into landscaping. Always divert runoff away from planted areas, and consider a biodegradable or citrus-based degreaser for applications near gardens. After rinsing, neutralize the area with water to dilute any remaining product before it reaches grass or soil.