Everyone knows what a carwash is— it’s where your car gets washed, right? The thing is, there’s more to washing cars than spraying the outside with a hose and using a vacuum in the interior. Sometimes, a car will need a little more attention than what you may be used to.
Foremost is the underbody wash. After all, it’s the part of the car that you don’t get to see. It’s understandable how some car owners might think that they can do perfectly without these undercarriage washes but we’re here to tell you otherwise.
In any vehicle, the area closest to the ground will be the dirtiest. That said, the kind of dirt you will find there is not the kind that will be easily removed. Asphalt, motor oil, and road debris are things that find ways to get stuck in hard-to-reach places under your car.
What Is an Undercarriage Wash?
An undercarriage wash (also called an underbody wash) is a targeted cleaning of the underside of your vehicle — the frame, suspension components, exhaust system, and wheel wells — using a pressure washer or dedicated undercarriage spray, sometimes with a rust-inhibiting solution.
Why It Matters in BC
- Road salt corrosion. Salt used on BC roads in winter clings to the undercarriage and accelerates rust far faster than dirt alone.
- Constant moisture. Rain and coastal humidity keep the underside damp longer than in drier climates, giving corrosion more time to set in.
- Hidden damage. Because you can’t see the underside day-to-day, rust and grime buildup often goes unnoticed until it’s already caused damage to brake lines or the frame.
How Often Should You Get One?
- Every 4-6 weeks in winter, especially if you drive on salted roads.
- Every 2-3 months the rest of the year, or more often if you drive off-road, near the coast, or on gravel regularly.
Is It Safe?
In simple words— yes. As long as you bring your car to a credible car wash, you can expect an underbody wash to be as uneventful as any car wash. The only difference would be the amount of dirt you will find here.
The important thing to make sure that your car is safe is to check if the carwash makes use of the right equipment. If they look like they’re struggling with the underbody wash, then they might not be the best place to have this done.
What is the Right Way?
Professionals will have a range of tools and power equipment that they will use, not to mention the chemicals involved. For example, the bits of asphalt that get stuck to the bottom of your car can be removed with kerosene or similar substances.
At home, you can probably do a few maintenance rounds once a month just to minimize the grim buildup underneath your car. Invest in a proper hose to help you get the job done and reach the different spaces underneath the vehicle.
Signs You Need One Now
It is important that you are able to tell when your vehicle needs cleaning. It’s perfectly manageable if you are able to set a regular schedule, that way you can plan around it and make sure you don’t have to rush anything.
To check, make sure you have enough clear space around your car. With a flashlight, go through all the sides of your car and look around for signs of grim buildup and such. If you think that the buildup is at a point that it is becoming thick, then it might be time to get it washed.
Other signs are:
- Visible mud or salt residue caked under the wheel wells
- A musty or metallic smell from underneath the car
- Reduced ride smoothness (grime can affect suspension movement)
DIY vs. Professional Undercarriage Wash
A garden hose or home pressure washer can knock off loose dirt, but it rarely reaches tightly packed grime around the frame rails and suspension. Professional-grade undercarriage sprays use higher pressure and rust-inhibiting solutions that get into those tight spots — and if you’re doing a mobile detail anyway, it’s a simple add-on rather than a separate trip.
Undercarriage Wash Guide
FAQs
How much does an undercarriage wash cost?
As an add-on to a regular wash or detail, it’s typically a modest add-on cost rather than a standalone expensive service — ask us for current pricing when you book.
Can I do an undercarriage wash myself at home?
Yes, with a pressure washer and an undercarriage attachment, but it’s easy to miss tightly packed areas around the frame and suspension. A professional wash reaches spots a home hose usually can’t. For those willing to sweat a little at home to get the job done, here are a few of the tools and equipment you might want to have around.
Power Washer
Car Wash brush set
Suggested cleaning solution for your car
Buckets and rags
Does an undercarriage wash prevent rust completely?
No wash can fully stop rust once metal is exposed, but regular undercarriage washing significantly slows it down by removing the salt and moisture that cause it in the first place.
Conclusion
At the end of the day, it’s all about taking care of what you have. Sure, you might not immediately see the dirt and grime stuck under your car, but you’ll never know how this buildup could cause you problems in the future. Take the initiative and make sure you can maintain your vehicle right.
Are you in need of car undercarriage washing services? Here at Yellow Star, we offer the very best in detailing and cleaning. Our staff has a broad knowledge of mobile auto detailing and relatable categories of auto industry. We are ready to take any type of car, trucks, boats, etc. Feel free to book your appointment online and get 10% off your auto detailing in Delta, BC today!