Zep Heavy-Duty Citrus Degreaser -- Best Overall
Zep's citrus-based formula attacks petroleum stains at the molecular level while leaving behind a faint citrus scent instead of harsh chemical fumes. You dilute it up to 10:1 for light jobs or apply it straight for years of caked-on grease. Coverage is excellent, making a single gallon stretch across a two-car garage floor. The formula is biodegradable, which matters if your floor drains to a yard or garden area. Works best with a stiff-bristle brush, followed by a pressure washer or hose rinse.
Check price on Amazon →We compared the top concrete garage floor cleaners for cutting through oil stains, grease, and grime. These are the products that actually deliver a clean floor.
A clean garage floor does more than look good. Grease and oil buildup can create slip hazards, attract pests, and make it harder to spot new leaks from your vehicle. The right concrete garage floor cleaner breaks down petroleum-based stains without damaging the slab or requiring hours of hard scrubbing. These five picks cover every scenario from routine maintenance to heavy degreasing.
| Product | Best For | Rating |
| — | — | — |
| Zep Heavy-Duty Citrus Degreaser | Heavy oil and grease | 4.8/5 |
| Simple Green Pro HD | All-purpose cleaning | 4.7/5 |
| Oil Eater Original Cleaner | Set-in stains | 4.6/5 |
| Spray Nine Heavy Duty Cleaner | Quick routine cleaning | 4.5/5 |
| RMR-86 Pro Instant Stain Remover | Stubborn deep stains | 4.4/5 |
How we test
We compare every pick against the field on real specifications, certifications, and aggregated owner reviews. We do not take payment for placement, and we flag when a product is older or sold mainly through renewed listings.
At a glance
| Pick | Best for | Score | |
|---|---|---|---|
| Zep Heavy-Duty Citrus Degreaser -- Best Overall | Check price | ||
| Simple Green Pro HD -- Best All-Purpose | Check price | ||
| Oil Eater Original Cleaner -- Best for Set-In Stains | Check price | ||
| Spray Nine Heavy Duty Cleaner -- Best for Quick Sessions | Check price | ||
| RMR-86 Pro Instant Stain Remover -- Best for Stubborn Deep Stains | Check price |
The picks, reviewed
Zep Heavy-Duty Citrus Degreaser -- Best Overall
Zep's citrus-based formula attacks petroleum stains at the molecular level while leaving behind a faint citrus scent instead of harsh chemical fumes. You dilute it up to 10:1 for light jobs or apply it straight for years of caked-on grease. Coverage is excellent, making a single gallon stretch across a two-car garage floor. The formula is biodegradable, which matters if your floor drains to a yard or garden area. Works best with a stiff-bristle brush, followed by a pressure washer or hose rinse.
Simple Green Pro HD -- Best All-Purpose
Simple Green Pro HD is a workhorse that handles not only oil and grease but also rust stains, tire marks, and general dirt. The alkaline formula is non-corrosive, making it safe around vehicles, rubber seals, and most coatings. It dilutes well and the concentrate format means a single bottle lasts months. This is the go-to pick for regular cleaning sessions where you want one product that covers everything without switching between multiple cleaners.
Oil Eater Original Cleaner -- Best for Set-In Stains
Oil Eater is formulated specifically for petroleum-based stains that have penetrated deep into the concrete pores. The water-based degreaser is safe for use around drains and won't leave a harmful residue. Apply it undiluted to old stains, let it dwell for 15 minutes, then scrub before rinsing. Multiple reviewers report it removing stains that other products left behind entirely. It comes in a ready-to-use spray for spot treatment or a gallon jug for large floor jobs.
Spray Nine Heavy Duty Cleaner -- Best for Quick Sessions
When you need a fast clean between bigger deep-cleaning sessions, Spray Nine delivers. The spray-on, wipe-off formula tackles fresh drips and grime before they have time to set. It is disinfecting as well as degreasing, which is a bonus for garage floors that double as workshop space. The trigger spray bottle means no mixing or measuring. It is not the right tool for old, ground-in stains, but for weekly maintenance it keeps floors looking consistently clean without extra effort.
RMR-86 Pro Instant Stain Remover -- Best for Stubborn Deep Stains
RMR-86 Pro is the heavy artillery for stains nothing else will budge. The formula penetrates porous concrete and breaks down organic and petroleum stains within minutes. It works on mold, mildew, oil, and tire marks. Use it in a well-ventilated garage and wear gloves, as the fast-acting formula is more aggressive than the other picks on this list. Apply, let it work for 5 to 10 minutes, then rinse thoroughly. Reserve this for the worst stains rather than routine cleaning.
What to look for
What to consider
Start by identifying your primary stain type. Oil and grease stains call for alkaline or citrus-based degreasers, while rust or mineral deposits respond better to acidic cleaners. Consider your floor's surface: sealed, epoxy-coated, or bare concrete each tolerate different chemistries. Concentrated formulas offer better value for large garages, while spray bottles work for spot treatment. Always check for drain-safe and biodegradable labels if your garage drains to the exterior. Ventilation matters, so choose lower-fume formulas if your garage has limited airflow.
What to consider
Keeping your garage floor clean is part of a broader maintenance routine. If you are also looking at garage organization and storage options, our guide to the [best garage shelving units](/articles/best-garage-shelving-units) covers the top picks. For more surface cleaning solutions, the [best pressure washers](/articles/best-pressure-washers) pair well with any of these cleaners for a complete floor refresh. See how we evaluate all our product picks at our [/methodology](/methodology) page.
FAQs
Most heavy-duty degreasers are safe for sealed and epoxy-coated floors, but you should always check the product label first. Harsh acidic cleaners can etch or dull certain coatings. For coated floors, pH-neutral or alkaline-based cleaners are the safest choice. When in doubt, spot-test in a hidden corner before treating the whole floor.
Old oil stains require a concentrated degreaser left to dwell for 10 to 20 minutes before scrubbing. Applying an absorbent like cat litter or baking soda overnight before cleaning can pull up residual oil from deep in the pores. For very stubborn stains, a second application or a pressure washer rinse will dramatically improve results.
