How to Clean Concrete: A Homeowner’s Step-by-Step Guide

Concrete driveways, patios, and walkways are built to last — but over time, dirt, algae, oil, and stains can make them look worn and neglected. The good news? With the right approach, most concrete surfaces can be cleaned safely and effectively.

This guide walks you through how to clean concrete properly, what tools to use, best to call a professional.

What You’ll Need to Clean Concrete

Before you start, gather the following:

Broom or stiff-bristle brush

Garden hose or pressure washer

Mild dish soap or concrete cleaner Bucket

Baking soda (for oil stains)

Protective gloves and eyewear

Avoid harsh acids unless recommended by a professional — they can damage the concrete surface.

Step 1: Remove Loose Dirt and Debris

Start by sweeping the area thoroughly. Removing loose dirt, leaves, and debris helps prevent scratches and allows cleaners to work more effectively.

For large areas like driveways, a leaf blower can save time.

Step 2: Rinse the Concrete Surface

Use a garden hose or pressure washer to rinse the concrete. This removes surface dust and preps the concrete for deeper cleaning.

Pressure washer tip:

Use a fan-tip nozzle and keep the wand moving to avoid etching the surface. Do not get too close to the surface or you will remove the top layer of cement and expose the aggregate.

Step 3: Apply a Concrete Cleaner

Mix a mild detergent with warm water or use a cleaner designed specifically for concrete. Pour or spray it evenly across the surface.

Let the cleaner sit for 5–10 minutes, but don’t allow it to dry.

Step 4: Scrub Stained Areas

Use a stiff-bristle brush to scrub stains, especially in high-traffic areas.

Common Stain Solutions

Oil stains: Sprinkle baking soda or cat litter, let it sit, then scrub

Mold & algae: Use oxygen bleach (never mix chemicals)

Rust stains: Use a rust remover approved for concrete

Step 5: Rinse Thoroughly

Rinse the entire surface with clean water until all soap residue is gone. Leftover cleaner can attract dirt and cause streaking.

Repeat the process for stubborn stains if needed.

Step 6: Let the Concrete Dry Completely

Allow the concrete to air dry for at least 24 hours before placing furniture back or walking on the surface heavily.

Should You Pressure Wash Concrete?

Pressure washing can be effective — but it must be done correctly.  When possible, a rotary pressure washer surface cleaner is recommended. 

✔ Safe for:

Driveways

Sidewalks

Unsealed patios

⚠ Use caution on:

Decorative or stamped concrete

Older or cracked concrete

Using too much pressure can cause surface damage, exposing aggregate and weakening the slab.

Seal Your Concrete for Long-Term Protection

After cleaning, consider applying a concrete sealer. Sealing helps:

Prevent stains

Reduce moisture absorption

Extend the life of the concrete

Improve appearance

Most sealed concrete should be resealed every 2–3 years.

When to Call a Professional Concrete Contractor

DIY cleaning works for light buildup, but professional help is recommended if you notice:

Deep oil or grease stains

Heavy algae or mold growth

Flaking or surface damage

Decorative or stamped concrete that needs special care

A professional can clean without damaging the concrete and recommend repairs if needed.

At Crockett & Sons Concrete, Inc., we want to help homeowners protect their investment with expert concrete care, cleaning guidance, and repairs.

We proudly serve:

All of Cecil and Harford County, MD as well as Chester County, PA

📞 Contact us today for a free estimate or concrete evaluation