Using a Foam Cannon (Lance) with an Electric Pressure Washer

Electric Pressure Washer + Foam Cannon Results

For a long time I have been watching both amateur and professional detailers post pictures of their car covered in a thick layer of foam and been jealous of their results – my basic Gilmour Foam Gun that connects to a regular hose spits out plenty of soap, but did not achieve anywhere near the same results. These professionals achieving the super foamy “covered in snow” washes were using special foam lances (also called foam cannons), and not just a basic sprayer like the Gilmour gun. These foam lances require a pressure washer to use, and therein lies the rub. Living in a small townhouse where the HOA takes care of the exterior of my home, I didn’t really have the desire to amass a large, loud, and expensive gas-powered pressure washer simply to wash my car every few weeks – that seemed like overkill…but when my GIlmour gun broke after 5+ years of faithful service, I started doing some research. Was a giant, noisy, expensive, gas-powered pressure washer really required to achieve that awesome foam coating I see on the internet all of the time? Are there at least some more compact (and cheaper) pressure washers out there so it doesn’t rob me of precious garage space if I do buy one? Alas, I stumbled upon several low cost & compact electric pressure washers on Amazon for a fraction of the price gas powered ones. Reading reviews on my favorite detailing sites made me nervous these electric units wouldn’t be strong enough, and the pros all recommend gas pressure washers. Most foam lances require a minimum of ~2 gallons per minute (GPM), but the more basic (and affordable) electric pressure washers are generally around 1.2-1.6 GPM, well below the 2 GPM minimum. Would an electric pressure washer be strong enough? Not even Amazon reviews could provide clear guidance, so I rolled the dice and placed my order to find out, choosing the GreenWorks GPW1501 13 amp 1500 PSI 1.2 GPM Electric Pressure Washer due to its compact size, built-in extension cord, and sub $80 price point. If it didn’t work, I could either return it, or at worst only be out $80. The pressure washer did come with its own foam/soap adapter, but to give my experiment the best chance of succeeding I also picked up a Chemical Guys TORQ Professional Foam Cannon and a gallon of their specially formulated Honeydew Snow Foam Cleanser, which set me back another $99.

The products next to the car, for size/scale purposes

Thanks to Amazon Prime, my new toys arrived in a little under two days, and it was time to see if this would all work. The reviews I had read were inconclusive at best as to whether a measly 1.2 GPM would be sufficient for a foam cannon, but I had my hopes. I hooked everything up and was pleasantly surprised by how compact the GreenWorks pressure washer was, and how long the extension cord was too – perfect for those with limited space and no exterior outlets (the included cord reaches from inside my garage to the driveway just fine). The foam cannon instructions advise to use 1-3 ounces of soap, which is difficult to gauge, so I just put about about a finger width of soap in the bottle and fired it up. If you haven’t guessed based on the first picture in this blog post – it worked! The car was coated in a thick layer of foam that clung to the car while the chemicals could do their work. Rather than the suds slipping right off like a basic foam gun that is shooting out mostly water, the foam cannon is shooting out mostly soap, hence why it sticks to the car more. Because the pressure washer uses less water, it’s actually a little more drought-friendly and there is less wasted water during both the soaping and rinsing stages of the wash. The lower GPM of the electric pressure washer isn’t actually a bad thing in this case, as it results in a more concentrated soap to water ratio. The only downside is that you probably need more soap than a gas washer, so plan on closer to a minimum of 3 ounces otherwise you’ll run out of soap before you’ve covered the entire car.

So it shoots more soap and uses less water which is great – but wait, that’s not all! As a longtime follower of the two bucket method of cleaning a car, I discovered this foam cannon really minimizes if not eliminates completely the need for a wash mit in the first place. I decided to skip using a mit and just see how clean the car would be after. I sprayed on the foam, waited ~5 minutes for the foam to do its work, then pressure washed it off…low and behold, the car looked spotless! Had all of this bucket filling and mit-scrubbing madness been a mistake? This was both easier AND quicker. Thinking maybe I was just lucky since my car was already pretty clean by most people’s standards (and coated with CarPro Reload sealant), I tried it out on my wife’s car next. Her black Ford Focus hadn’t been washed in ~2 months, and it really showed. I refilled the foam cannon with a decent amount of soap (my first attempt ran out of suds about 80% of the way through), sprayed the car in foam and waited about 5 minutes like before, then sprayed everything off – and once again the car looked just as clean as the two bucket method I had been employing previously. Amazing!

Chemical Guys TORQ Foam Cannon w/adjustable spray pattern

So my $200 experiment turned out to be a great success. My compact and fairly low PSI & GPM electric washer was able to achieve plenty of pressure to get the job done without being a nuance or requiring any fossil fuels. Beyond just a new toy, the benefits of this setup are a long list, too:

  • No scrubbing = no risk of marring your paint
  • Less time to wash
  • Much less water used
  • Easy clean-up
  • No buckets needed
  • Pressure washer can be used for other things (patio, driveway, etc.)
  • Easier to clean hard to reach areas (wheel wells, undercarriage, etc.)
  • No need to scrub wheels or use harsher chemicals to eliminate brake dust
  • Professional level results
  • Cool “snow foam” pictures for Instagram
After a few minutes of sitting, the foam still clings to the car

While I’m sure a gas-powered pressure washer would achieve even better results, the electric pressure washer achieves at least 80% of the results and is only about 20% of the cost. For the amateur detailer like myself that has limited space and budget, it’s a perfect solution. If you don’t have any outlets or space, a Gilmour Foam Gun & Two Bucket method is fine too, but if you want to step it up a notch without breaking the bank, then an electric pressure washer and Chemical Guns foam lance is a great solution.

Got any tips for a newbie at using a foam cannon? Have a favorite soap? Give me some pointers in the comments!

Bonus shot – 50/50 of my driveway being pressure washed!

Nick Roshon

Nick has been an Audi owner and fanatic for the last 10 years, and started Nick's Car Blog in 2009 to share DIYs and pictures of his A4. Currently he drives a 2012 Audi TT-RS, and has previously owned a B7 S4, B7 A4, and an 82 Audi Coupe (GT) LeMons race car. In his day job, Nick is a digital marketer and lives in San Diego, CA, USA.


  1. Hi Nick,

    You may or may not remember me, but you helped me out immeasurably a few years ago in replacing a couple of turn signal lights on my 2008 S4 Avant. Your blog about the foam cannon is perfect for me.

    I replaced the Audi with a 718 Boxster last fall when they first appeared. I absolutely love the car and I, too, bought an electric pressure washer, primarily to clean the wheels (damn brake dust). I also have a gas pressure washer, but I felt it put out too much pressure and I was afraid of damaging the paint, fittings, etc. The Karchear (sp) electric model (lower pressure) I have works beautifully for the wheels.

    Up until reading this blog, I was a bucket and mit guy for the surface washing portion, I live in Fort Lauderdale and washing a car in the summer is really a pain in the a** as it is so humid and ugly. That, with the frequent rain, makes putting off washing my car relatively easy. I do so until the wheels get so ugly with brake dust build-up that I can’t stand it. As you may imagine, this article on the foam cannon is a true god-send. Until today, I’d never even heard of them. But if you’re satisfied with the results, knowing how picky you are with your cars, I’m going to get one of these cannons to go with my electric washer ASAP. Obviously, I need to be careful with the convertible top, but this does seem to be my salvation.

    As always, thank you for sharing your insights via your blog. Absolutely fabulous!


    Robert Brown
    Fort Lauderdale, FL

  2. Great review. One of my friends with a couple Porsches has been doing some research on this particular subject for the past month, and after your review, he is going to look at purchasing that particular pressure washer you have recommended. One thing to note is that he already has been researching the foam cannon, and found this budget version that has some great reviews:

  3. Interesting! I saw that one, but it explicitly says a minimum of 2.0 GPM water flow, so I skipped it knowing this electric pressure washer is only 1.2 GPM. The Chemical Guys lance didn’t have an explicit minimum rating, and claims to “work with any foam lance” so I thought I’d give it a shot, especially since Chemical Guys is a pretty well known company. I’d be curious to try the other one, it’s definitely a better value if it works.

  4. Awesome, great to hear from you Robert – and very cool you’re still subscribing to my blog even though you’ve moved up to Porsche! Yeah, I think you’ll be very happy with this solution. I think the Karcher pressure washers require a special adapter, but otherwise this should work great for you.

  5. What is the adapter that you got to put on the end of your power washer wand to connect to the foam cannon?

  6. I enjoy reading your blog. I just bought a black 2008 S4 and like some others had never heard of a foam gun for cleaning a car. I always thought pressure washers would ruin the surface of the paint (I even do wheels by hand) but that does not seem to be your experience and you are at least as picky as I am. Maybe a video of you doing this would be helpful! Anyway, thanks!

  7. Hey Doyle – yeah, it’s safe…I wouldn’t do something super high pressure and super close to the paint, especially if your paint is chipping or rusting, but for modern cars like yours that have been cared for well it’s no risk at all. This pressure washer is no stronger than the coin operated ones you see around town, give or take. I don’t have any videos, but you can check some out on YouTube that others do 🙂

  8. Thanks for sharing your experience. How loud is the pressure washer? I’m trying to find a solution for early morning and don’t want to wake the neighbors.

  9. Yeah, it’s got a high pitched whine. It’s not as loud as a gas powered pressure washer, but I wouldn’t call it quiet either. I can’t hear my stereo over it so I wear Airpods when I pressure wash to be able to listen to audio.

  10. Ah, so I might be stuck with the Gilmour for the early mornings or difference might be worth it to wash the cars in the early evening.

  11. Hi Nick,
    Nice review, same thing here, I own an electric pressure washer (only 1.2 gpm) because I’m afraid a gas model would be too much to clean the car.
    I’m waiting for my foam cannon to arrive to know if it will do it and I’m glad to see it’s working for you.
    To get the foam slightly thicker, you can change the orifice nozzle from 1.25mm to 1.1mm, a cheap mod easy to do.
    Enjoy the car washing!

  12. Know this is a late response, as its now August of 2021, but a couple comments here. First, nice car. lol. But the photo doesn’t appear to show thick foam. Looks pretty runny, IMO. I have an inexpensive 1600 psi Ryobi, and the foam seems a little thicker than yours but still not quite where I’d like it. I think one of the biggest changes you can make first is to change the orifice in the foam canon to a smaller one. This allows less water to come through, giving the soap a higher percentage, and therefore more foam. – plenty of reviews on YouTube. Then i would suggest to get a soap that is specifically designed for foam canons, as they will usually foam better. And lastly, I would then up the pressure a bit if your space and budget allow. Although I have a house in L.A., I also have limited space as well, and as much as i would love the pressure of a gas one, I just don’t think I want to deal with the cons that come with it, so I am looking for that perfect balance between size, pressure, and price. I don’t know how much the actual foam canon has to do with it, as I don’t have enough experience with them. I think more expensive ones are probably just more durable with better parts? Maybe you or others have more feedback at this time on what has worked for you. And lastly, I have a 2016 BMW now, which has been impressively reliable so far, but dam do I miss my Audi. I had a 2007 S6 with the V10 motor. That car was a nightmare with regards to being in the shop for repairs, and ultimate reason I sold it, but dam did I love that car. It’s still my favorite car I’ve ever had. The raw power mixed with the luxury it had inside was just awesome. My seats in the Bimmer suck in comparison. And the sound of that motor! Had several people come to me and ask about it. But I digress. 🙁 Thanks for the post.

  13. Hey Robert – totally agree with your comments. I upgraded to a smaller orfice and that did make a nice difference. There are better electric pressure washers out there, just be prepared to spend about 2X the price of this one…so far, I’m still happy with mine. Could be better, but more than gets the job done!

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