What Can and Can’t Be Pressure Washed? A Clear Guide for Homeowners 

Pressure washing is a cleaning powerhouse. With the ability to blast away dirt, grime, and mold, it’s no wonder many homeowners and professionals rely on it to tackle difficult exterior cleaning tasks. But before you go full steam ahead, there’s one crucial thing to understand—not every surface can withstand high-pressure water. 

Knowing what can and can’t be pressure washed is essential to preserve your property and avoid costly damage. Follow this guide to discover six key questions to ask before pressure washing, as well as a breakdown of surfaces that can handle the force and those that should stay far away from the nozzle. 

Ask Yourself a Few Questions Before You Pressure Wash 

Why is this surface being cleaned? 

Understanding your cleaning goal is key—are you removing deep stains, grime, or mold? Each situation calls for different cleaning methods. For example, tough grease stains might require higher pressure, while general dirt can often be handled at a lower setting. 

What is the surface made of? 

Before revving up your pressure washer, take a minute to assess the material. Durable surfaces like concrete can typically handle high pressure, while soft materials like painted wood or old brick can crack, chip, or strip under the force. 

What pressure level should be used? 

Not every surface needs high-powered water to clean effectively. Some materials—like vehicles or wooden fences—require a more delicate approach. Always start with a lower pressure setting and test in an inconspicuous spot. 

Do I need any special tools or accessories? 

The right tools make all the difference. Attachments like wide fan nozzles can ensure gentler cleaning on delicate surfaces, while precision nozzles can focus on tougher, hard-to-reach grime. 

Am I equipped with the right knowledge and tools to avoid damage? 

Pressure washing might seem simple, but without proper technique, you can cause costly damage. If you’re unsure, it might be best to call in a professional. After all, it’s better to be safe than sorry. 

Now that you’ve asked the right questions, let’s break down the types of surfaces that can and can’t be pressure washed. 

What You Can Pressure Wash 

Sidewalks and Driveways  

Concrete and paved surfaces are some of the best candidates for pressure washing. The powerful water stream can quickly eliminate mold, mildew, and stubborn stains, leaving your driveway and sidewalks looking brand new. 

Decks and Patios  

Wooden and composite decks can be pressure washed with careful adjustments. Use a lower pressure setting to protect the finish and avoid splintering the wood. 

Fences  

Wood, vinyl, and metal fences can all be pressure washed. Be mindful of pressure settings based on the material, and avoid blasting any vulnerable joints or edges. 

Exterior Walls (Most Siding Types)  

Vinyl, brick, and stucco walls are generally safe to pressure wash, but use the right settings. Vinyl requires caution to prevent warping, while certain types of brick—or older brickwork—may call for reduced pressure. 

Roofs (Certain Types)  

For asphalt shingles or tiles, pressure washing can remove algae and moss buildup. However, use a soft-washing technique (low pressure combined with specialized cleaning solutions), as high pressure can cause severe damage to roofing materials. 

Cars, Boats, and Other Vehicles  

Your SUV or family boat can sparkle again, but keep the pressure on a low setting. Too much force can chip paint, damage decals, or dent panels. For vehicles, a gentle approach ensures a safe and effective clean. 

What You Shouldn’t Pressure Wash 

Delicate Surfaces (Wood, Painted Surfaces, and Some Metals)  

Wooden furniture, painted wood, aluminum siding, or untreated metals can be irreparably damaged by high-pressure water. Stripping paint, causing splinters, or denting are just a few potential issues. 

Electrical Outlets and Wiring  

Never pressure wash directly at electrical components. Moisture can seep into outlets or wiring, causing short circuits or dangerous malfunctions. 

Windows and Glass (Without Proper Care)  

Glass is highly vulnerable to cracking under intense water pressure. While glass and windows can be cleaned with a soft wash technique, inappropriate settings or incorrect nozzles can create costly repairs. 

Roofs (Certain Roof Types)  

Some roofing materials like slate, tile, or delicate shingles can sustain significant harm. Stick with professional soft-washing services for these fragile surfaces. 

Landscaping and Gardens  

Pressure washers and plants don’t mix. The powerful jets can flatten flowers, strip leaves, or disturb plant roots. Use a garden hose around landscaping if you need to rinse dirt or debris. 

Soft or Fragile Concrete Surfaces  

Older concrete and painted concrete surfaces are prone to peeling or flaking under high-pressure washing. Approach these surfaces with caution, using alternative cleaning methods when necessary. 

Tight Spaces with Sensitive Materials  

High-pressure water streams have a knack for finding their way into delicate areas. Be especially mindful around HVAC systems, vents, or areas near loose fixtures. 

Call the Experts—Window Hero to Take the Guesswork Out of Pressure Washing 

Managing your property’s maintenance is a full-time job. There’s no reason to add pressure washing worries to your plate. At Window Hero, we specialize in professional pressure washing services that not only give your home a sparkling clean but also ensure no surfaces are damaged in the process. 

Whether it’s tough grime on your concrete driveway or delicate siding that needs a soft approach, we have the expertise and tools to handle the job effectively. With Window Hero, you can rest easy knowing your property is in capable hands. Don’t take the risk—trust your cleaning to the heroes who do it best. Click here to find your local Window Hero location.