August 20

How To Clean Exposed Aggregate

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While renovating the yard comes across as a brilliant idea, proper maintenance becomes a crucial factor in making the changes or additions worth it.

So, when my husband decided to replace the existing driveway with an exposed aggregate one, I was naturally very excited. Now, I don’t have a lot of knowledge about how different surfaces should be maintained, so I was just happy thinking about how good my front yard would look.

While the construction was in process, my neighbor Jonathan would often visit the area to check on the progress. After all, it was he who helped my husband finalize the contractors for the purpose. 

During one such visit, I asked him to stay over for lunch, only to spend a boring afternoon listening to my husband and him discuss different ways to maintain the driveway in the future. And both of them also managed to convince me about writing a guide on the topic, which I have managed to do after three years.

Hi! I’m Stacy, and today, I have curated this guide to help you figure out how to clean exposed aggregate surfaces. Jump in!

Type Of Stains On Exposed Aggregate Surfaces

One of the most common problems that most homeowners face is the formation of unwanted stains on exposed aggregate surfaces.

That’s why I have listed the different types of stains that exposed aggregate surfaces are usually prone to. And I have also mentioned some effective ways to get rid of them with minimum hassle.

1. Bore Water Stains

In case you didn’t know this, bore water (or groundwater) can sometimes form small pools on many surfaces. In case of exposed aggregate surfaces, the water can accumulate between the loose gravel or rocks. As the water dries or evaporates, the dissolved mineral (mostly iron) stays behind to form reddish-brown stains, resulting from the oxidation of iron or rust.

These stains are best cleaned by using cleansers with strong acids, which break down the rust and wash them away. However, they can be extremely toxic, especially if not handled with care. Hence, you may want to hire professional aggregate surface cleaners for this purpose.

2. Grease And Oil Stains

Grease and oil stains are generally formed when cars with oil leaks are parked on an exposed aggregate driveway for long. And if not taken care of, these stains can cause permanent damage to the surface.

Much like bore water stains, these stains can also be removed using cleansers like chemical degreasers. But you must follow the brand instructions carefully to avoid corroding the surface or burning yourself. Here again, you can seek professional help to make your driveway as clean as new.

Alternatively, you can use a DIY solution of baking soda, water, and dishwashing soap. Simply add about ½ cup of baking soda and ⅛ cup of the dishwashing soap to 1 gallon of water and mix well. It’s no less effective than chemical cleansers, which is why Jonathan swears by it!

Now, you can either pour this all over the surface or add little on specific parts for spot cleaning. In either case, let the solution sit for a few minutes, scrub the surface with a soft brush, and rinse well.

3. Tyer Stains

Honestly, my exposed aggregate driveway hasn’t really seen bore water or grease stains. However, it has had a fair share of tire stains, which were extremely difficult to remove because of their water-resistant properties. 

In fact, I had tried a couple of DIY solutions to eliminate them, but to no avail. So finally, I had to fall back on chemical degreasers. And trust me- you would want to remove even the faintest tire marks before they become stubborn.

But while at it, make sure you cover yourself with adequate protective clothing, face shield, rubber gloves, and boots so that no part of the body remains exposed. Likewise, use a hard broom or stiff brush (preferably with a handle) to scrub the surface.

Some Other Useful Tips

Cleaning the driveway and patio has always been my husband’s department, as he doesn’t believe that I can take care of these spaces as well as him. So, when I removed the tire marks from the driveway on my own, he was quite impressed.

However, I won’t take the entire credit, as my mission wouldn’t have been successful without implementing a few tricks that I have observed from his cleaning techniques. And in this section, I will talk about just those.

1. Brushing The Area

No matter how stubborn the stain is, start by sweeping the area with a brush or broom to remove any loose dirt or debris. This will help the cleaner go deeper into the surface and also prevent rocks or gravel from flying around during rinsing.

2. Using A Pressure Washer

Once you’re done applying the cleanser, use a pressure washer to clean the surface thoroughly. My husband borrowed it from Jonathan all the time before he bought one for his workshop, and I have always seen him using the spray fan (white) nozzle attachment. 

Upon inquiring about the same, he told me that it produces the most gentle stream, which is ideal for delicate surfaces like the exposed aggregate ones. Furthermore, the pressure should be between 2,000 and 3,800 PSI (pounds per inch square).

3. Using The Right Technique

Aside from following the usage instructions of the chemical cleaners you use, it’s crucial to handle the pressure washer the right way. My husband always takes care to keep the nozzle at least a foot away from the surface (especially the edges) and use swift horizontal motions, which ensures uniform cleaning.

Final Words

Cleaning that exposed aggregate surface doesn’t seem to be a very big challenge now, does it?

The only thing that you need to keep in mind is that if you’re using chemical cleansers, stick to the usage instructions provided by the brand. I’d also suggest watching online tutorials to better understand the process.

And if it’s your first time cleaning such a surface, you can start by using DIY solutions or hiring professional cleaners- whatever floats your boats!

On that note, it’s time for me to wrap up today’s guide. I’d love to hear your feedback in the comments section below. 

Take care!


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