Simpson 15-Inch Surface Cleaner Review: Is It Worth Buying?

Overview

I’ve been running pressure washers for almost fifteen years. Residential jobs, commercial parking lots, farm equipment — I’ve seen what works and what’s junk. When Simpson sent me their 15-inch surface cleaner, I was skeptical. A $90 attachment claiming to handle 4000 PSI? That’s cheap territory. Usually means plastic gears and leaks on the first tank of gas.

This thing is for homeowners who have a driveway or patio larger than a queen mattress. It’s also for guys like me who hate kneeling down with a wand for four hours. If you’ve got a 3000+ PSI pressure washer and you’re tired of tiger striping your concrete — this is the tool you’re looking at. But is it the one you should buy?

Short answer: Yes, with one big caveat. I’ll get to that.

Key Features

The Simpson 15-inch surface cleaner is straightforward. No bells. No whistles. Here’s what you get:

• 15-inch cleaning path — covers more ground than the cheap 12-inchers
• Rated for 4000 PSI — matches gas-powered machines well
• Two high-pressure nozzles — standard 1/4-inch quick connects
• Weighs 8 pounds — light enough to carry one-handed
• Aluminum body — not stamped steel that rusts
• Universal handle — fits most trigger guns, but you might need an adapter

What stands out is the weight. Eight pounds. My old BE Power Equipment surface cleaner is nearly thirteen. After two hours of pushing that boat anchor, your shoulder reminds you it exists. The Simpson is noticeably easier to maneuver.

The aluminum housing surprised me. Most cheap units use thin steel that bends on the first rock. This one felt solid out of the box. The handle connection is brass — that matters because plastic threads strip fast when you’re cranking down a garden hose.

One thing missing: there’s no built-in swivel stop. Some surface cleaners have a collar that keeps the hose from spinning around your gun. This one doesn’t. You’ll have to manage the hose twist yourself. Annoying, but not a dealbreaker.

Performance

Last Saturday I tackled my own driveway. Two-car width, about 40 feet deep. Oil stains, tire marks, moss along the edges. I used my Simpson PowerShot 4400 PSI gas washer with the stock 25-degree nozzle. Swapped on the surface cleaner in about thirty seconds.

First impression: it glides. The wheels are wide and roll smooth over broom-finished concrete. No skipping. No chattering. That’s rare for a cheap surface cleaner — they usually bounce on every expansion joint.

I cleaned the whole driveway in 22 minutes. Same job with a wand takes me 90 minutes and leaves striping that makes me cringe. The 15-inch path eats up square footage fast. Overlap your passes by about 3 inches and the concrete looks uniform — like a power broom swept it.

Oil stains? Mixed results. Fresh oil came up easy. Old, baked-on stains from the previous owner’s leaking Buick — those needed a second pass with degreaser first. The surface cleaner won’t replace scrubbing heavy grease. But for general grime, mildew, and dirt, it’s fantastic.

I tried it on my wood deck. Bad idea. The pressure is too concentrated at 4000 PSI — it gouged a furrow into a soft pine plank before I could lift it. This unit is for concrete and masonry only. Don’t use it on wood, don’t use it on siding unless you want to shred vinyl. Stick to concrete, brick, pavers, stone.

Car cleaning? Some guys try. I wouldn’t. The 15-inch head is too wide for wheel wells or bumpers, and the pressure blast can force water into door seals. Get yourself a foam cannon and a wand for vehicles.

One annoyance: the quick-connect fitting on the body leaked. A slow drip, not a spray, but enough to wet my boots after twenty minutes. I put a single wrap of Teflon tape on the male end and it stopped. Shouldn’t have to do that on a brand new unit. But it’s a five-second fix.

Build Quality

Aluminum housing. Brass fittings. Steel axles on the wheels. The handle is metal too — not that rubber-coated junk that cracks after a season in the sun. Everything feels overbuilt for $90.

The underside has a ceramic bearing that the spray bar rides on. That’s important. Some units use a plastic bushing that melts if you run hot water or let the thing sit in direct sun. This bearing should last.

But I found a problem. The wheels have a plastic hub. After three uses, the left wheel developed a wobble. Not enough to affect cleaning, but it rattles. I tightened the axle nut with a socket and that helped some. Still, I’d rather see brass bushings all around. For $90, that’s asking a lot.

My old Karcher K5’s surface cleaner had a plastic housing that cracked the second season. This Simpson is built way tougher. The handle doesn’t flex when you push. The body doesn’t deform if you accidentally drop it off the tailgate.

One design flaw: the hose inlet is on the back, angled downward. Sounds fine, but the hose drags on the ground right at the connection point. After a few hours, that abrasive wear will eat through the hose jacket. I rigged a small spring guard from an old washing machine hose — works, but you shouldn't have to MacGyver a brand new tool.

Pros & Cons

Pros

• Cleans 2x faster than a wand, no striping
• Lightweight and easy to push
• Aluminum body resists rust, unlike steel units
• Price is hard to beat
• Works great on concrete, brick, and pavers

Cons

• Wheel wobble developed quickly
• Quick-connect leaked out of the box
• No anti-swivel collar — hose twists up
• Useless on wood and soft surfaces
• Won’t replace scrubbing heavy oil stains

If I’m being honest: the wheel wobble bugs me more than the drip. A leak you fix once. A wobbling wheel gets worse over time. I’ve used it six times now and the wobble hasn’t gotten worse, but it hasn’t gotten better either.

Value for Money

$90 is the sweet spot for a 15-inch surface cleaner. BE Power Equipment’s version runs $130. Simpson’s own MegaShot unit is $120 and doesn’t perform any better. The Ryobi 15-inch is $99 at Home Depot and uses a plastic housing — no thanks.

I’ve also used a Whisper Wash Pro that costs $250. That thing is commercial grade — dual handles, anti-swivel, stainless everything. It’s beautiful. But for a homeowner cleaning their driveway twice a year, $250 is nuts. The Simpson does 85% of the same job for 40% of the price.

Where it loses value: the wheel issue and the drip. If Simpson fixed those two things and charged $110, I’d still buy it. As is, it’s a solid value if you’re willing to spend five minutes tweaking it. The 4000 PSI rating means it won’t bog down on a powerful washer — cheap units choke above 3500 PSI and you have to walk slow. This one keeps up.

Comparison: my neighbor has a Karcher K1700 electric unit (1600 PSI, 1.2 GPM). He tried my Simpson on his machine. It worked, but barely. The surface cleaner needs flow. If your pressure washer is under 2.0 GPM, skip this — you’ll get poor rotation and uneven cleaning. This accessory belongs to the gas-powered crowd.

Verdict

Buy it if: You own a gas pressure washer with at least 3200 PSI and 2.5 GPM. You have a driveway, patio, or walkway bigger than 200 square feet. You hate the tedium of wand cleaning. You don’t mind Teflon taping a fitting and maybe tightening a wheel nut.

Skip it if: You have an electric pressure washer weaker than 2000 PSI. You only clean wood decks or vinyl siding. You want something that works perfectly out of the box with zero fuss. In that case, budget another forty bucks and get the BE Power Equipment unit — same design, better quality control.

My take: It’s a lazy purchase that requires a tiny bit of labor. That’s weird to say about $90 tool, but it’s true. You’ll spend ten minutes adjusting the wheels and fixing the leak. After that, it works great. I’ve used mine on three job sites this month — cleaned a 1,500 square foot paver patio in under an hour. The customer asked if I resurfaced it. That’s the power of a good surface cleaner.

Would I buy it again? Yes, but I’d budget an extra $5 for a tube of thread sealant and a pack of Teflon washers. That’s not a dealbreaker — that’s reality in the budget-tool world. Simpson could easily make this perfect for $100. They didn’t. But for $90, it’s still the best option in its class.