Many DIY cleaning attempts fail because a dirty driveway often contains different types of stains that each need a different cleaning method. You might have an oil spot on your driveway or a patch of slippery moss or a layer of dull grey grime all over it. These are three problems that need to be dealt with. If you want to know how to clean a concrete driveway, you need to start by figuring out what exactly you are looking at.
First, Figure Out What You’re Actually Cleaning
Identifying the problem is the first step to choosing the right cleaning method.
| WHAT YOU SEE | WHAT IT IS | WHICH SECTION YOU NEED |
|---|---|---|
| Dark, glossy, roughly circular stains where a vehicle parks | Petroleum stains such as oil or transmission fluid | Oil stains section |
| Green or black patches that feel fuzzy or slippery | Moss, algae, or lichen | Moss and algae section |
| Uniform grey or brown film across the slab | General dirt, pollen, and road grime | Deep cleaning section |
| Rust-orange stains | Rust from irrigation or metal furniture | FAQ |
In the Pacific Northwest, moss and algae grow on many driveways because the region’s frequent rain and shaded conditions create an ideal environment for year-round growth
What to Clean a Concrete Driveway With
The type of stain on your driveway determines the right cleaning solution.
| CLEANER | BEST FOR | CAUTIONS |
|---|---|---|
| Dish soap or detergent | General dirt and grime | Safe but slow on heavy staining |
| Alkaline degreaser | Oil and grease | Follow label directions |
| Sodium hypochlorite (bleach) solution (1 part bleach to 10 parts water) | Moss and algae | Keep away from plants and storm drains |
| Enzymatic or microbial cleaner | Old oil stains | Works slowly and may require repeat treatments |
| Commercial concrete cleaner | Stubborn stains | Use only as directed on the label |
It is really important to know what things you should not use on concrete.
- Muriatic acid can permanently damage concrete.
- Wire brushes leave metal pieces behind that will rust later.
- A pressure washer with a zero-degree tip can permanently damage the concrete surface.
How to Clean a Concrete Driveway: Removing Oil Stains
Cleaning oil stains from a driveway can be difficult because concrete absorbs oil into its pores.
Fresh Spills
If the spill is still wet, act as quickly as possible.
- Cover the spill with cat litter, sawdust, or baking soda and let it sit for several hours to absorb the oil before sweeping it up.
- Next, you should use an alkaline degreaser on the spill.
- Next, scrub the area with a nylon brush and rinse it thoroughly.
None of this happens overnight, but all of it gets more expensive the longer it’s left unaddressed.
Set-In and Old Stains
Old stains require a different approach because the oil has already penetrated the pores of the concrete.
- Apply an absorbent, then cover the stain with a thick degreaser paste or poultice.
- If the product instructions recommend it, cover the stain loosely with plastic.
- Now you just have to wait for the time as per the instructions.
- After that you take off the material and rinse the whole area.
A poultice works by drawing oil out of the concrete rather than washing the stain from the surface. Enzymatic cleaners or microbial cleaners are also an option, but they take a bit longer to work.
When the Stain Won’t Come Out
Some oil stains stay in concrete for years; they might not go away completely. In some cases you can make the stain lighter. It is not realistic to think it will disappear totally.
Based on experience, some old stains can become significantly lighter, but complete removal is not always possible. It’s crucial to have realistic expectations here because concrete holds onto spills from years ago. If multiple treatments do not remove the stain, commercial hot-water equipment and professional surface-cleaning tools may achieve better results than household products.
How to Get Rid of Moss and Algae on a Driveway
Cleaning moss from driveway surfaces takes more than pressure washing. Moss and algae spread through spores, so simply washing away the visible growth often does not stop them from coming back. When you use a pressure washer, it only removes the visible material; it often leaves behind tiny spores. Conditions that make moss grow, like damp and shaded areas, are still there, and this is the reason why moss usually grows back.
The right way to do it is the following:
- Use a treatment that is safe for concrete or a bleach solution diluted according to the product label to kill moss.
- Let it sit for a while as per the instructions on the label to make sure it kills the moss.
- Then scrape off and sweep away the dead moss.
- Finally, wash away any leftover dirt or residue.
When you are cleaning your driveway, it is best to remove the dead material first. This way you do not spread the material all over the driveway. When using bleach solutions, protect nearby plants and trees. After you are done cleaning, you should rinse the surrounding areas well. In the Pacific Northwest, avoid letting cleaning products enter storm drains or waterways because they can harm local rivers and salmon habitats. To slow down the growth in the future:
- Make sure the water drains properly around the driveway.
- Trim overhanging branches to let in more sunlight and reduce shade.
- Treat problem areas regularly.
In wet climates, moss will eventually return, so regular maintenance works better than waiting for heavy buildup.
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Call (206) 310-9881Washing Off General Grime and Dirt
Regular cleaning helps remove dirt, dust, and debris that accumulate on a driveway over time.
Using a Pressure Washer for Driveway Cleaning
A pressure washer can remove years of built-up dirt and grime from a concrete driveway. The concrete in your driveway can usually handle around 3,000 PSI from a pressure washer.
To get the results you should do a few things.
- Use a nozzle that’s either 25 degrees or 40 degrees.
- You should never use a nozzle with a zero-degree tip.
- Always keep the wand moving; do not hold it still.
- Hold the wand at a distance from the surface.
Stopping in one spot or changing your distance from the spray can create zebra stripes on the concrete. If you keep moving and maintain the same distance, you can help prevent stripes from forming on the concrete.
A rotary surface cleaner attachment helps create an even finish and prevents the striped appearance that can happen with a standard pressure washer wand. When you are working on the slope, do it in sections. Start at the top of the slope and work your way down, keeping the surface evenly wet as you clean.
How to Clean a Driveway Without a Pressure Washer
If you want to clean a driveway without a pressure washer, you can still get good
results with basic tools.
To clean a driveway without a pressure washer, follow these steps.
- First you need to wet the driveway with a garden hose.
- Next, you need to apply some detergent.
- scrub the driveway with a stiff-bristle brush.
- Finally, you need to rinse the driveway with a garden hose to get all the soap off the driveway.
This method is good for light dirt and grime, but it takes a lot more time and physical effort than using a pressure washer.
Keeping It Clean (and When to Seal)
Sealing concrete every two to three years helps stop oil and other contaminants from getting into the surface, although the timing depends on the type of sealer and how much traffic the driveway gets. You should only apply sealer when the concrete is totally dry and fully cured.
Conclusion
A stained driveway usually has three problems. You get oil stains, living growth like moss and algae, and general grime all over the place, and each one needs its own cleaning method.
DIY cleaning works well, but cold-water consumer pressure washers may not remove deep oil stains as effectively as commercial hot-water equipment. Commercial surface cleaners and hot-water equipment can do a lot more than the machines you buy for home use. If your driveway needs a deeper level of cleaning, check out our professional driveway pressure washing services.
FAQ’s
Is it worth pressure washing a driveway?Pressure washing is good at getting rid of most surface dirt and pollen that builds up on concrete. When you use a pressure washer, use around 3,000 PSI and a 25-degree or 40-degree nozzle. If you use too much pressure or a zero-degree tip, you can badly damage the surface.
Can you clean a driveway without a pressure washer?Yes. If you are looking for a way to clean a driveway without using a pressure washer, you can use a garden hose and some detergent and a stiff-bristle brush to get rid of dirt and grime on the driveway. The process takes a lot more time and effort than a pressure washer.
Does bleach or vinegar damage concrete?Bleach is usually safe if you use it the right way and rinse it well. It can hurt plants nearby if you are not careful, and in the Pacific Northwest, bleach runoff should be kept out of storm drains because it can harm local waterways and salmon habitats. Vinegar is acidic, so using it a lot might harm some concrete surfaces. You should avoid acids, like muriatic acid, because they can permanently damage concrete.
How much does professional driveway cleaning cost?The cost depends on the driveway size, the type of staining, and whether treatments for oil, moss, or algae are needed. Contact us for a quote for an accurate estimate.
