Guide to Cleaning Your Car's Undercarriage
How To

A Comprehensive Guide to Cleaning Your Car’s Undercarriage

Keeping your car’s undercarriage clean is essential to maintain its good condition. A clean undercarriage will help make sure that your car runs smoothly, stays free of rust and corrosion, and looks great for many years to come. In this comprehensive guide, we will provide all the information you need to give your car’s undercarriage a deep clean. We will cover the equipment and safety considerations necessary before you start as well as step-by-step instructions on how to pressure wash, degrease and scrub the area, and apply a protective coating. Finally we’ll give some tips for keeping your car’s undercarriage in tip-top shape in between cleanings.

What You’ll Need

Before you start cleaning your car’s undercarriage there are a few things you should have on hand

Equipment Needed

To give your car’s undercarriage a deep clean you will need an air compressor with a pressure washer attachment or an electric pressure washer if you don’t have access to an air compressor. Additionally, depending on the degree of dirtiness of the area, you may want to pick up a degreaser to dislodge stuck-on debris and a brush or scrubber to get rid of any remaining residue.

Safety Considerations

Guide to Cleaning Your Car's UndercarriageBefore you begin the cleaning process, make sure you wear safety gear such as gloves, goggles and long sleeve clothing for protection from any debris or chemicals that may be present in the area you are cleaning. Additionally, if you are using an electric pressure washer make sure that it is grounded and away from water sources such as puddles or pools of standing water as it can cause electrical shock when used near these sources.

Cleaning Process

Now that you have all the equipment and safety precautions in place, it’s time to start cleaning! Follow these steps for a deep clean:


First start by clearing away any large debris such as leaves, dirt and rocks in the area with your hands or a broom so they don’t clog up your pressure washer nozzle. Once everything has been cleared away spray down the area with water first to loosen up any dirt before starting up your pressure washer.

Pressure Washing

Set your pressure washer nozzle to low pressure (800-1000 psi) and begin to spray the area in a circular motion. Make sure to keep the nozzle 6-12 inches away from the surface to avoid damaging it. Move slowly and keep the spray consistent across all areas of your car’s undercarriage for about 10 minutes.

Degreasing and Scrubbing

Once you have finished pressure washing, use a degreaser and brush or scrubber to get rid of any remaining residue on your car’s undercarriage. Make sure that you follow all safety instructions and wear protective gear when using this step.

Protective Coating Application

Once you have finished scrubbing, apply a protective coating such as wax or a sealant to help protect your car’s undercarriage from rusting or corrosion in the future. Follow all directions on the product label carefully when applying this step to make sure that you are getting optimal protection for your vehicle’s undercarriage.

Tips for Keeping Your Car Undercarriage Clean

Now that you’ve given your car’s undercarriage a thorough deep clean, here are some tips on how to keep it looking great between cleanings:

  • Avoid driving through puddles of water as much as possible to reduce the amount of dirt and grime that gets stuck on your car’s undercarriage.
  • Park in shaded areas to keep the area cooler and reduce the amount of sun exposure, which can accelerate rusting and corrosion.
  • Use a car cover when your vehicle is not in use to keep it clean and free from dirt, dust, grime and other debris.


Keeping your car’s undercarriage clean is essential for maintaining its good condition. In this comprehensive guide we have provided all the information you need to give your car’s undercarriage a deep clean including what equipment you will need, step-by-step instructions on how to pressure wash, degrease, scrub and apply a protective coating, as well as some tips for keeping it looking great between cleanings. With just a little time and effort you can have your car’s undercarriage looking like new!

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