How to Pressure Wash Your Garage: Learning the Basics

It’s that time of year again when the weather is just right for cleaning your garage. Using a pressure washer is a great way to get the job done, but it’s essential to use the correct pressure washer and take the proper steps. In this post, we will walk you through the process of using a pressure washer on your garage floor.

We’ll start by discussing some of the pressure washer basics, like choosing between pressure washers and sweeping up the debris. Then we’ll move on to more specific instructions, like preparing degreaser and using the correct pressure and distance when washing concrete floors. Finally, we’ll talk about what to do after completing the job. Let’s get started!

Choosing the Right Pressure Washer for Garage Floor

Choosing the correct pressure washer is very important, which is the first step to pressure wash garage floors. If you have an oversized garage, you’ll need a powerful machine to handle the job. A less powerful pressure washer will suffice for smaller garages to wash your garage floor. You’ll also need to decide on the type of nozzle and pressure washer wand you want to use. A wide-angle nozzle is excellent for covering large areas quickly, while a narrow-angle nozzle is better for getting into tight spaces.

Electric Powered Pressure Washers vs. Gas Powered Pressure Washers

Pressure washers are available in electric and gas-powered, but gas models are often stronger. For this reason, a gas-powered pressure washer is often better to pressure wash your garage floor. A gas-powered washer with a minimum rating of 3,000 PSI and 3 GM is ideal for cleaning a garage.

However, never use a gas-powered machine in an enclosed garage, which can be deadly. Always keep the door open.

Use an electric pressure washer to clean if an outlet is available and the garage floor is not particularly dirty. Be sure to read the directions properly and follow all safety instructions before you pressure wash.

Pressure Washer vs. Power Washer When Pressure Washing Garage Floor

It’s important not to confuse a pressure washer with a power washer. Both use high-pressure water to clean surfaces, but power washers primarily use hot water. 

While power washing is helpful for tougher stains, it’s essential to use caution when using hot water around cars or other delicate items. A power washer is likely unnecessary cleaning garage floors.

Sweep Up any Garage Floor Debris

The next step is to sweep up debris like leaves, sticks, and other objects that may be in your way. Consider sweeping thoroughly and maybe even using a vacuum cleaner. Now is also an excellent time to work on any oil and grease stains that you think may be particularly challenging. Then, rinse down the garage floor with a garden hose in preparation for pressure washing.

Prepare the Degreaser

Garage floors can accumulate a lot of grime over the years. If your garage floor is covered in oil stains or grease, you’ll need to prepare a degreaser before washing.

Many commercial degreasers are available, but you can also make your own by mixing dish soap and water. Be sure to read the instructions carefully and follow all safety precautions.

You can place the degreaser directly in the soap tank of your pressure washer. If your pressure washer does not have a soap tank, you can apply a degreaser directly to the garage floor in advance. Allow the degreaser to sit for about 10 minutes before pressure washing.

Cover up Furniture and Other Garage Items

If you have any items in your garage that you don’t want to get wet (like cars, bikes, and other equipment), be sure to cover them up. Suppose you spend a lot of time in your garage, relaxing on a couch, or watching television. In that case, you will, of course, want to cover or remove these items before you wash your garage floor.

Pressure washing can be a messy process, so it’s important to take precautions. It’s also vital that you cover any outlets.

Begin to Pressure Wash Garage Floor

Now it’s time to start pressure washing the garage floor. It’s important to move in the correct direction- from the indoors towards the outdoors. Spray outwardly towards the door, so all of the dirty water can easily make its way outside and will not be pushed towards the direction of your home.

Begin with lower water pressure and increase the water pressure as needed to pressure wash the garage properly. Keep the cleaning wand about two feet from the floor and use a wide-angle spray pattern. Spray back and forth across the garage floor. Do not linger for too long in one spot, which can damage a concrete floor.

Which Pressure Washer Nozzle to Use

There are several different pressure washer nozzles available. You’ll want to use a wide-angle nozzle with low pressure for a garage floor to avoid damaging the floor while still getting it clean.

Pressure washer nozzles chart

If necessary, you can use a more narrow-angle nozzle for particularly tough spots but avoid damaging the garage floor. Be sure to read the instructions that came with your pressure washer for more guidance on which nozzle to use.

Garage Floor Pressure Washing Safety

Pressure washing garage floors can be a dirty and challenging job, but it’s important to take safety precautions. Pressure washers can be dangerous, so always stay aware of your surroundings and keep children and pets away from the area. And when using a gas-powered pressure washer, be sure to use proper ventilation.

Finish Pressure Washing the Garage Floor

Rinse away any remaining dirty water or degreaser. You may need to make several passes to ensure that all the soap and debris have been removed. Once you’re finished, turn off the pressure washer and disconnect any hoses or power cords.

Allow the garage to dry completely before walking on the floor or parking any vehicles inside. Drying may take several hours, depending on the temperature and humidity levels. If you need to speed up the drying process, you can use a fan or open up the garage door.

FAQ about Pressure Washers and Garages

What kind of pressure washer should you use for a garage floor?

A gas-powered pressure washer with a minimum rating around 3,000 PSI is ideal for cleaning a garage floor. However, never use a gas-powered machine in an enclosed garage. Always keep the door open.

What is the best degreasing product for pressure washing a garage floor?

Many commercial degreasers are available, but you can also make your own by mixing dish soap and water. Oil Eater Cleaner Degreaser is a top-rated product for degreasing garage floors and removing oil stains. For pressure washer specific concentrate, we typically use Simple Green. Be sure to read the instructions carefully and follow all safety precautions.

Can I use a pressure washer on epoxy floors?

Pressure washing can be safe for epoxy floors, but always test in a small, inconspicuous area first to make sure the floor will not be damaged. Use a low pressure tip and a wide-angle nozzle when pressure washing an epoxy floor.

How long does the degreaser need to soak?

The degreaser should soak for about ten minutes before pressure washing.

What kind of protective clothing is needed when pressure washing a garage?

Pressure washers can be dangerous, so always wear protective clothing, including gloves, goggles, and ear protection. Long pants and closed-toe shoes are also recommended.

Should pressure washing be done before or after grinding?

Pressure washing should always be done after grinding. Grinding removes any loose or peeling paint, which could create a dangerous situation if it gets into the eyes or lungs. Pressure washing will remove any remaining dirt and debris.

Should garage door sensors be covered before pressure washing?

You can cover your garage door sensors briefly if you like, but pressure washing should not harm them. Just be sure to keep the pressure washer at a safe distance. About two feet away from the door sensors.

Should you tape plastic to the walls if they are sheetrocked?

If you have walls that would be damaged by water, then you should cover them with plastic before pressure washing the garage. Tape the plastic to the wall and seal any seams with duct tape. Ensure there is plenty of ventilation, and never use a pressure washer in an enclosed garage.