How to Clean a Concrete Walkway

Concrete walkways are durable and inviting. Though they are dependable, they are often neglected. When concrete is not sealed, it adsorbs everything in its environment. Leaves, pollen, dirt, and moss are common issues seen on concrete walkways. Without proper maintenance, these can permanently stain. Concrete can be cleaned via mechanical method and/or chemical method. This article will combine both method to clean a concrete walkway like a professional, the right way. These methods pertains to regular, unsealed concrete. This method SHOULD NOT be used for decorative or stamped concrete. For instructions on cleaning stamped or decorative concrete, look up my other articles.

Difficulty: Moderately Easy

Instructions

Things You'll Need:

• 3500+psi pressure washer
• Dish soap
• Broom
• Muriatic Acid
• Ammonia
• Water

1. Start by pressure washing. Keep the tip close enough to remove and penetrate into the concrete. Do not keep it too close as to remove the concrete finish. Any thing on the surface should blow off with the pressure.

2. Measure 1/2 gallon of muriatic acid and pure into a five gallon bucket. Carefully fill the bucket with water. Use rubber gloves and eye protection for precaution. This is a 10:1 mix. Use the same ratio if larger or smaller mixes are needed.

3. Use a broom to spread and scrub concrete with the acid mix. Initially, the acid will cause the concrete to fizz. Let it sit for 10 minutes. If there are any stains, use a more concentrated mix. Don't let the area sit for it will discolor. Wash it all off with a hose.

4. Pour 1 gallon of ammonia into a five gallon bucket. Fill the rest with water. With a broom, pour and spread the ammonia mix over the entire deck. Let it sit for 10 minutes and rinse with a hose.

5. Finally, scrub the concrete walkway with some soap water and a broom. Use plenty of soap in order to penetrate into the crevasses. After it dries, it is recommended to seal the walkway. Sealing should take place only when the deck is clean and dry.

Tips & Warnings

• Use grinder or wire brush to remove deep stains.
• Keep your concrete walkway happy,.. seal it.
• Use bleach for dark moss.
• Do not come too close to the concrete with the pressure washer.
• Use caution when working with acid.

Resources

• Concrete Cleaning and Sealing Services