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A small electric pressure washer is the right first buy for most car owners. Car-care guidance, including advice from Turtle Wax, points to around 1,500 PSI as a safe level for paint, so a big gas machine adds power a car can’t use.
You don’t need one to get a car clean, though. A hose and the two-bucket method work fine. Buy a washer if you want faster rinsing or plan to use a foam cannon.
Electric vs gas at a glance
| Electric | Gas | |
|---|---|---|
| Built for | Cars and light home jobs | Heavy outdoor cleaning |
| Where it runs | Near a safe outdoor outlet | Outdoors only, well away from buildings |
| Upkeep | Mostly storing it properly | Fuel, oil and engine care |
| Right for car washing? | Yes, for most people | Only if you already own one |
Electric pressure washers
This is the one to buy first, because it suits the pressure paint can handle and asks for the least upkeep. Sun Joe, Greenworks, Ryobi, Karcher and Worx all sell electric models.
Here’s what to look for:
- Pressure near 1,500 PSI, or a way to turn it down.
- A flow rating (GPM) that fits your priorities. Higher flow rinses faster, and lower flow uses less water.
- Wide nozzles in the box. You want 25-degree and 40-degree options, or a wand that adjusts to them.
- A quick-connect wand if you might add a foam cannon later.
- Hose and cord length that lets you walk around the whole car.
Skip anything sold mainly on its maximum pressure number, and any model with no way to fit a wide nozzle.
Shop: electric pressure washers for cars, Sun Joe electric models or Karcher electric models
Electrical safety: the CDC says to test the ground fault circuit interrupter (GFCI) before each use. Many electric washers have one built into the plug or cord. Manuals differ on extension cords. Worx, for one, says not to use them on a cord with a built-in GFCI, so follow the manual for your model.
Gas pressure washers
A gas washer is built for big outdoor jobs such as long driveways. It only makes sense for cars if you already own one for that work.
If you do, look for adjustable pressure or use the widest nozzle and stay well back from the paint. Skip buying one just for the car.
Carbon monoxide warning: never run a gas washer in a garage or other enclosed space. The CDC says to keep it at least 20 feet from any window, door or vent.
Shop: gas pressure washers with adjustable pressure or Simpson gas models
Nozzles
Nozzle color tells you the spray angle, and a wider angle spreads the force. Most washers come with a few, and a separate set is useful if yours doesn’t include the wide ones.
| Color | Angle | On a car |
|---|---|---|
| Red | 0 degrees | Never |
| Yellow | 15 degrees | Never |
| Green | 25 degrees | Wheels, tires and the underside |
| White | 40 degrees | Rinsing paint |
| Black | 65 degrees | Applying soap |
Look for a quick-connect set that matches your wand’s fitting and your washer’s pressure rating. Skip rotary or turbo nozzles for car work. They spin a 0-degree pattern and can damage a surface quickly.
Shop: quick-connect nozzle sets
Foam cannons
A foam cannon clips onto the wand and lays down thick suds before you touch the paint. It’s a nice upgrade, not a necessity. Look for one that matches your wand’s fitting, and skip foam guns here, since those are made for garden hoses. See the wash supplies page for how it compares with a foam gun, and the foam cannon guide for how to use one.
Shop: foam cannons for electric pressure washers
Stay safe around the car
A pressure washer can do real harm to a car, and to you, so the pressure washer guide is worth reading before your first wash. The short version:
- Keep your distance. Start well back from the paint and only move in if you need to.
- Keep the spray off damaged paint, window seals, badges, trim and electronics.
- Never aim at people, pets or your own feet. The CDC warns that high-pressure spray can cause serious wounds that look minor at first, so get medical care right away if it happens.
- Check your city or county rules on runoff, since they vary by place. This post on driveway washing explains why.
What to buy first
Start with the electric washer. Add a nozzle set only if the wide nozzles aren’t included, and leave the foam cannon until you’ve used the washer a few times.
If you’d rather not store a machine or drag out a hose, a mobile detailer brings the equipment to you.