By the Mr. Suds team, Cory & Brooke Cooper, Kingwood, TX
Around Kingwood, sidewalks go green fast. We live in The Livable Forest, and all that shade plus our Gulf Coast humidity is a perfect home for algae.
So we hear the same two questions on nearly every estimate: what does this cost, and could I just do it myself?
After more than twenty years cleaning concrete around here, we will give you the honest numbers, the real timeline, and the exact kind of cleaner we use. No mystery.
How much does sidewalk pressure washing cost?
Most sidewalk and concrete cleaning runs about $0.20 to $0.50 per square foot for larger areas. Small sidewalk jobs are priced higher per foot, or at a flat minimum service charge. A typical residential sidewalk job lands somewhere around $150 to $500, depending on the length, the condition, and how badly it is stained.
That range is wide for a reason. Here is what actually sets your number.
What does a small job actually cost?
This is where most price guides leave you guessing, so let’s be specific.
How much to pressure wash a 15 ft walkway?
A 15 ft walkway is a small job. At three or four feet wide, that is only about 45 to 60 square feet of concrete.
At pure per-square-foot pricing, that math looks tiny. But no pro can load up, drive out, and set up for a few dollars. So small jobs like this are priced at a minimum service charge, often in the $100 to $150 range.
That is not a markup. It simply covers the time, fuel, water, and cleaner it takes to show up and do it right.
How much does it cost to pressure wash 1,000 square feet of concrete?
A larger 1,000 square foot area is where per-square-foot pricing kicks in.
At $0.20 to $0.50 per square foot, you are usually looking at around $200 to $500. Bigger jobs cost less per foot because the setup is spread across more area.
What makes the price go up or down?
A few things move the number every time:
- Condition: light dust cleans fast, while years of buildup take longer
- Stains: oil, rust, oxidation, and heavy algae need extra cleaner and passes
- Access: tight gates, slopes, and obstacles add time
- Surface type: smooth concrete is quicker than stamped or textured
The cleaner and simpler the job, the closer you sit to the low end.
How do professionals price concrete washing?
There is no secret formula. Good pros price one of two ways, and we will tell you which we are using.
Per square foot vs. a flat minimum
For a big surface, we measure it and price by the square foot. For a small one, we use a minimum charge so the trip makes sense.
Either way, the goal is the same: a fair number that reflects the real work.
Why light dirt costs less than oil, oxidation, and heavy algae
Plain dirt rinses off quickly. Oil has to be broken down with a degreaser first. Oxidation and thick algae need the right chemical and a little dwell time.
More cleaner and more passes mean more time, and time is what you are really paying for.
How we build a Mr. Suds quote
When we look at your sidewalk, we check the size, the surface, the staining, and the access. Then we give you one clear price before we start.
The person quoting you is the person doing the work. That is Cory, every time, so nothing gets lost between a salesperson and a crew.
How long does it take to pressure wash a sidewalk?
Most sidewalks are quick. A small, well-kept path can be done in well under an hour.
| Concrete area | Typical cleaning time |
| Small sidewalk (200 to 500 sq ft) | 30 to 60 minutes |
| Medium walkway or patio | 1 to 2 hours |
| Large concrete area (800+ sq ft) | 2 hours or more |
Heavy oil, gum, or thick algae adds time, since those need pre-treatment and sometimes a second pass. A standard front walkway, though, is usually a fast visit.
Should you pressure wash your sidewalk?
Yes, and here it is about more than looks.
Curb appeal, safety, and the slippery-algae problem
A clean walkway makes the whole front of your home feel cared for. That matters for guests, and even more if you are selling.
But the bigger reason is safety. That green film is algae, and when it gets wet it turns slick. We have cleaned plenty of walkways that had quietly become a slip hazard, especially near shaded entries.
Why Kingwood’s shade and humidity make this a regular job
Our tree canopy is beautiful, and it is also why shaded concrete here grows algae so fast.
Add in the humidity, and the north-facing, shaded stretches of sidewalk go green again every year. For most local homes, an annual clean keeps it in check.
The catch: pressure alone doesn’t stop the green from coming back
Here is something a lot of folks do not realize. Blasting a sidewalk with water removes the surface stain, but it does not kill the algae at the root.
Worse, too much pressure can chip the top layer of the concrete, which actually gives the growth an easier place to take hold. The lasting fix is the right cleaner, not just brute force.
How do you clean a dirty sidewalk without a pressure washer?
You can absolutely do a light cleaning by hand. For a small, lightly soiled walkway, it is a reasonable weekend job.
The simple dish soap and scrub method
Start by sweeping the path clear of leaves and loose dirt. Then:
- Mix a couple teaspoons of dish soap into two gallons of warm water
- Scrub the concrete with a stiff brush
- Let it sit for five to seven minutes
- Rinse with a hose or a bucket of water
That handles everyday dirt on a small surface just fine.
For tougher stains and mildew (and one caution about vinegar)
For mildew and the green stuff, a mix of one part bleach to three parts water with a few drops of dish soap works well and helps kill the growth.
You will see vinegar and baking soda recommended too. It can help on light marks, but go easy. Vinegar is acidic, and left too long it can etch and dull your concrete. Rinse it well.
What is the best soap to clean concrete with?
The best cleaner depends on the stain, but a few do the heavy lifting for most jobs.
Store-bought concrete cleaners that work
For general grime and stains, these are solid, homeowner-friendly choices:
- Simple Green Oxy Solve or their Concrete & Driveway Cleaner, biodegradable and safe around plants and pets
- Zep Driveway and Concrete Cleaner, a heavy-duty option safe on sealed surfaces
- Karcher Concrete Cleaner, a budget-friendly pick that dilutes a long way
For oil, you want a dedicated degreaser, which breaks the oil down so it rinses away.
A safe homemade option (and what we use on the green)
A homemade mix of one part bleach to three parts water with a little dish soap cleans and disinfects general concrete nicely.
On the algae we battle here, we go a step further with a mildewcide that kills the growth at the root. That is the difference between a clean that lasts a season and one that lasts a week.
Frequently Asked Questions
How much should you charge to pressure wash a 15 ft walkway? A 15 ft walkway is only about 45 to 60 square feet, so it usually falls under a minimum service charge rather than pure per-foot pricing. Expect something in the $100 to $150 range to cover the trip, setup, and cleaner.
How much does it cost to pressure wash 1,000 square feet? At roughly $0.20 to $0.50 per square foot, a 1,000 square foot concrete area typically runs about $200 to $500. Larger jobs cost less per foot because the setup spreads across more area.
How do you price concrete washing? Pros price either by the square foot for large areas or with a flat minimum for small ones. The number rises with heavy staining, oil, oxidation, and difficult access, and drops for light, simple dirt.
How long does it take to pressure wash a sidewalk? A small sidewalk of 200 to 500 square feet usually takes 30 to 60 minutes. Heavy oil, gum, or thick algae adds time for pre-treatment and a second pass, but most front walkways are a quick visit.
Should you pressure wash the sidewalk? Yes. It restores curb appeal and, more importantly, removes the slippery algae that turns a shaded walkway into a slip hazard. In our humid, tree-shaded area, an annual clean is smart.
What is the best soap to clean concrete with? For general cleaning, Simple Green, Zep, or Karcher concrete cleaners all work well. A homemade mix of one part bleach to three parts water with a little dish soap is a safe option. For oil, use a degreaser.
Will the green just come back? Pressure alone removes the stain but not the root, so it can return. The lasting fix is cleaning with a mildewcide, which is why a professional clean tends to stay clean much longer.
Want a real number for your sidewalk?
Now you have the honest picture: what it costs, how long it takes, and what actually keeps concrete clean.
If you would rather skip the scrubbing, we are glad to help, even on small jobs. We will usually bundle your sidewalk with the driveway, patio, or windows so the visit is well worth it. And we will give you a clear price before we start.
Call or text us at (281) 635-4507 or request your free estimate online. You will get the same two owners every time, fully insured, who have kept Kingwood-area concrete clean for over twenty years.