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8 Rookie Power-Washing Mistakes to Avoid This Spring

By Shelby Deering Dengarden

Updated May 9, 2026 8:36 AM

A man in yellow boots uses a pressure washer on a stone patio in a vibrant garden full of plants and flowers. Damian Lugowski / Getty Images

As we emerge from winter, you can't help but notice all the dirt and grime that's accumulated around the exterior of your home. After the last frost, you can certainly get out the hose and rinse off a few things here and there, but some jobs definitely require a power washer.

"Spring is a great time to get out and clean," says Wayne Clark, Owner of Foothills Exterior Cleaning Services in Simpsonville, South Carolina. "Over the winter, when it rains or snows, that moisture sits for long periods of time, causing a breeding ground for algae, mold, mildew, mos, lichen and all of the other organic matter to grow. Come springtime, there's typically a good buildup of these organic growths that need to be cleaned."

And although it might seem like a straightforward process, if you're new to power washing, you can actually make a lot of mistakes that can do more harm than good. Here are the major ones to avoid.

1. Using the Wrong Tip for the Wrong Surface

arena photography — Diane079F / Getty Images

Special attention should be paid to the types of tips you're using on specific projects around your home. Clark cautions that using the wrong tip for the wrong surface is a common rookie mistake.

He says, "Using too strong of a tip could cause etching on the surface, remove paint, cause oxidation or even make the surface look like Zoro got hold of it."

The moral of the story? Go with a lower-strength tip to start and increase slightly if necessary.

2. Using High Pressure on the Wrong Surface

You might also use high pressure on the wrong surface. Clark explains that using high pressure on a surface that isn't meant to have high pressure on it can cause damage to that surface, "thus creating a hefty repair and replacement bill."

3. Using a Power Washer on New Concrete

"New concrete takes weeks to settle," Clark says. "When high pressure is put on new concrete, especially if it's over 1800 PSI, there's a high likelihood that the cream coat will be damaged or removed, causing a streaky or damaged look that you can't undo."

4. Using a Power Washer on Non-Masonry Material

Clark says that high pressure should never be used on vinyl siding, Hardie board siding, wood, roofs or any other non-masonry material.

"High pressure can remove paint, cause oxidation issues, damage shingles, damage wood or put holes in the siding," he adds.

5. Using a Power Washer From a Ladder

"You should never use a power washer from a ladder, especially if you aren't soft washing," Clark says. "The kick-back that the gun gives creates an unsafe atmosphere that can cause even the most experienced person to come tumbling down from a ladder."

6. Filling Up a Power Washer with Gas While It's Running

Clark emphasizes that you should never fill up a gas-powered power washer with fuel while it's running.

"This seems obvious, but I've seen and heard many stories of someone filling their machine up with fuel while the machine is running-a little drips off to the side, the fuel ignites and it causes an explosion, thus creating the opportunity for someone to be severely injured, burned or even killed."

7. Doing Soft Washing Incorrectly

You shouldn't utilize the soft washing technique without "pre and post wetting vegetation," Clark warns.

He goes on to say, "This is a common issue we hear about. You should always pre-wet any vegetation before doing any sort of soft washing, as well as giving the vegetation a good rinsing after the soft washing is complete. Also, never let any soft washing solution dry on vegetation. This ensures the vegetation stays healthy and alive once the job is complete."

8. Not Tightening the Tips

Clark adds that another common setup mistake that definitely be avoided is not tightening the tips enough on the power washer.

"Make sure that when you are installing the tips to the power washer gun, the tips are in snug and that the quick-connect is locked in place," he advises. "I've heard horror stories of people firing up their power washer, squeezing the gun and the tips fly out and bust a window, hit a car, hit a person, etc. It's really important to make sure that the tip is installed correctly and secured before ever firing up the machine."

Why It's Important to Power-Wash the Right Way

Clark emphasizes that you should always keep safety in mind when power washing.

"These power washer machines, even the ones with ‘lower' PSI, can cause severe injury or even death if not properly used," he says. "There are fire hazards associated with not fueling them properly. There are electrical hazards that come with the electric models."

And then you could be injured from the high pressure that emerges from the nozzle.

"If you hit any portion of your body with the high pressure coming out of the power washer, there is a high possibility that you can be injured," Clark says. "That pressure is generally coming out anywhere from 1800 to 4400 PSI, depending on the type of machine you have. That is enough to cut through skin and bone, especially if you have the wrong tip on the end of the washer gun. This could lead to one expensive hospital bill."

Next, there's the possibility that you could damage your property with a power washer.

"Using high pressure on a surface you aren't supposed to power wash will have a high likelihood of damaging that surface," Clark says. "Also, using the wrong tips on the end of the power washer can damage a surface. Using a power washer to clean a surface that isn't meant to be cleaned with high pressure, or using the wrong tip on the washer, could cost you thousands in repair and replacement costs."

To sum up: take appropriate safety measures, make sure you understand how your power washer works before you use it and never use it on surfaces it's not designed to clean.

This story was originally published May 9, 2026 at 8:00 AM.