How to Clean a Garage Floor
Toronto garages accumulate a specific mix of grime: winter road salt tracked in by tires, oil and fluid drips from vehicles, mud and grit, and general workshop debris. Here's how to clean a concrete garage floor properly through each season.
Tools and Supplies
- Stiff-bristle push broom
- Garden hose or pressure washer (access to outdoor spigot)
- Floor squeegee
- Concrete degreaser (Zep Heavy Duty Degreaser or similar from Canadian Tire)
- Cat litter or baking soda (for fresh oil spills)
- Stiff deck scrub brush
Spring Cleanup (Post-Winter Priority)
Salt residue from winter roads is the garage floor's biggest enemy — it draws moisture, creates white efflorescence on concrete, and can contribute to surface erosion over time.
- Sweep or blow out all loose debris, salt, and sand
- Mix a solution of warm water and TSP (Trisodium Phosphate, available at hardware stores) or a concrete floor cleaner — TSP neutralizes salt effectively
- Apply to the floor, scrub in sections with a stiff deck brush
- Rinse thoroughly with a garden hose and squeegee the water toward the floor drain
- Allow the floor to dry completely — this can take a full day in cool spring weather
Oil and Fluid Stains
Fresh oil stains: Cover immediately with cat litter, baking soda, or cornstarch and grind it in slightly with your foot. Leave 1–2 hours to absorb the oil. Sweep up, then apply a concrete degreaser to the spot, let sit 10 minutes, scrub, rinse.
Old set oil stains: Apply a commercial concrete degreaser generously (Zep or Purple Power work well). Let sit 15–20 minutes. Scrub vigorously with a stiff bristle brush. Rinse. Repeat for heavy staining — a single application often doesn't fully remove old stains but lightens them significantly. For very old, deeply penetrated stains: a poultice of absorbent material (diatomaceous earth or fuller's earth) mixed with degreaser, applied and left overnight, is more effective than surface application.
Pressure Washing
A pressure washer is the most effective tool for a full garage floor clean. Use 1,500–2,000 PSI on concrete (too high damages the surface). Apply degreaser first, let dwell, then pressure wash in overlapping strokes. Squeegee water toward the drain. Avoid pressure washing in below-zero temperatures — the water can freeze in cracks and cause spalling.
Floor Drain
Garage floor drains accumulate sediment, oil, and debris. Remove the drain cover and clean it with a brush and degreaser. Pour a bucket of hot soapy water down the drain to flush the trap. If the drain is slow, a drain snake or enzymatic drain cleaner will clear the blockage.
Sealing
Applying a concrete sealer or epoxy floor paint after cleaning significantly reduces future staining — oil and salt don't penetrate a sealed surface. Available at Home Depot; a one-car garage floor takes 2–3 hours to apply and requires the floor to be clean and dry for at least 24 hours first.
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