Learn how to tackle common concrete stains and keep your surfaces looking like new.
Over time, concrete develops stains, especially when oil, rust, mold, or organic messes sink into its porous surface. But with the right approach, even the toughest stains can be lifted and your concrete brought back to life.
TL;DR
In this guide to cleaning stained concrete, we’ll show you the major types of concrete stains, what causes them, and how to clean them.
In This Article:
Organic Stains (Pet Waste, Food, General Odors)
Whether it’s pet urine, barbecue grease, or a forgotten pile of wet leaves, organic stains can soak deep into concrete’s pores and leave behind odors that linger.
Enzymatic cleaners are a natural, pet-safe solution that digests the source of the stain and smell at a molecular level. They’re ideal for:
- Pet accidents
- Food spills
- General organic grime
- Musty odors
Related Resource: How to Use Enzymatic Cleaners on Concrete
Rust Stains
Rust stains occur when metal objects are left sitting on concrete in humid weather. Rust stains are notorious for abrobing deep into the concrete and are often caused by:
- Grills
- Metal patio furniture
- Lawn tools
- Metal flower pot bases
- Umbrella stands
To remove rust, start with lemon juice or white vinegar for lighter stains. For deeper discoloration, you might need to upgrade to a commercial rust remover (but read all labels carefully as acids can etch your concrete!).
Related Resource: How to Remove Rust Stains from Concrete
Oil Stains
Oil stains are easily absorbed by porous concrete, making them hard to remove. Use kitty litter or baking soda to absorb fresh oil and limit the amount that seeps into the concrete.
For old, stubborn stains, dish soap, concrete degreasers, or even TSP (tri-sodium phosphate) can do the trick. Follow up with pressure washing to clean away the residue.
Related Resource: 6 Ways to Clean Oil Off Concrete
Mold & Mildew Stains
Mold and mildew stains tend to show up in shady, damp places like patios, shaded walkways, and basements.
Use vinegar or a mold-killing detergent for minor growth. In tougher cases, a diluted bleach solution and a good scrub-down may be needed.
Related Resource: How to Clean Mold from Concrete
Concrete Cleaning FAQs
Can I pressure wash stained concrete?
Yes, pressure washing concrete can help remove stains. Pre-treating with the right cleaner first will likely be necessary before pressure washing to remove deep-set stains.
Will sealing concrete stop stains?
Yes, sealing concrete can significantly reduce the chance of stains getting absorbed into the concrete due to the moisture barrier created by applying a high-quality sealer.
Can stains come back after cleaning?
If the source of the stain (like mold or pet odor) isn’t fully removed or the area stays damp, it might return. Sealing concrete and ensuring proper drainage can help prevent recurring stains.
Don’t Just Clean It… Protect It!
You’ve scrubbed, sprayed, and sealed… now what? Keeping your concrete looking good means staying one step ahead of the next stain.
- Seal your concrete: A high-quality penetrating sealer blocks moisture and helps repel stains.
- Keep up with maintenance: Sweep regularly, clean spills quickly, and inspect for cracks and drainage issues.
- Call in the pros: For deep cleaning, sealing, and lifting sunken slabs, A-1 Concrete Leveling has your back.
Let the pros at A-1 Concrete Leveling bring your concrete back to life with professional cleaning and sealing services. Request a Free Estimate Today
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