How to Remove Stains from Concrete Patio (2025 Guide)

Your concrete patio looked pristine when installed, but now it’s marred by stubborn oil splatters, rust marks, and mysterious dark stains. These blemishes ruin your outdoor aesthetic and can even become slip hazards. The right concrete stain removal techniques can restore your patio’s appearance without damaging the surface. In this guide, we’ll cover 7 proven methods, including pressure washing and homemade solutions like vinegar-based cleaners.

Key Takeaways

• Act fast – Fresh stains are easier to remove
• Match solutions to stain types – Oil vs. rust vs. organic
• Protect concrete – Avoid harsh chemicals that cause pitting
• Prevent future stains – Sealants reduce absorption

1. Pressure Washing (Best for Deep Cleaning)

A pressure washer (1,500-3,000 PSI) blasts away ground-in dirt, mildew, and old paint. Rent one or buy an electric model for under $200. Hold the nozzle 12″ from the surface at a 45° angle to prevent etching. For tough stains, use a rotary surface cleaner attachment. Always test on a small area first.

2. Vinegar & Baking Soda Paste (Eco-Friendly Option)

Mix white vinegar and baking soda into a thick paste. Apply to stains, scrub with a stiff brush, then rinse. This works well for:

• Rust stains
• Mineral deposits
• Light oil marks

For extra power, add hydrogen peroxide.

3. Degreasers for Oil & Grease Stains

Concrete absorbs oils from grills, cars, and furniture. Use a commercial degreaser or make your own:

4. Oxygen Bleach for Organic Stains

Unlike chlorine bleach that damages concrete, oxygen bleach safely removes:

• Mold/mildew
• Leaf stains
• Algae

Mix 1 cup powder per gallon of warm water. Apply with a garden sprayer.

5. Poultice for Set-In Stains

A clay poultice draws out deep stains. Mix diatomaceous earth or kitty litter with acetone or hydrogen peroxide. Cover with plastic for 24+ hours before scrubbing.

6. Rust Removers for Metal Stains

For rust from furniture or tools, use:

• Lemon juice + salt
• Commercial rust removers
• Oxalic acid solutions

7. Concrete Resurfacer (Last Resort)

If stains won’t budge, apply a thin concrete overlay or stain-blocking primer before repainting. Choose products rated for exterior use.

Stain Removal Comparison Table

For maintenance, consider concrete sealers that repel stains. Sweep weekly and address spills immediately. With these methods, your patio will stay stain-free for years.