Is It Better to Spray or Not Spray Before Pressure Washing? 4 Pros and Cons

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  • Pretreating your driveway with a pressure washer spray before washing helps break down stubborn oil, paint, and rust stains that water pressure alone can't remove.

  • Cleaning solvents for pretreatment cost $10 to $20 per bottle, so you'll spend more on supplies when you spray concrete before pressure washing.

  • You can skip pretreatment if your driveway only needs dirt and debris removal, but tough stains need the extra cleaning power to come clean.

  • Hiring a local power washing professional provides expert help with old or widespread stains, using the right solutions and techniques to restore your driveway.

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Pressure washing is a great way to keep your driveway clean, but pressure washing alone isn’t always enough to blast away old or deep-set stains. If you’re dealing with stubborn oil stains, for example, you’ll need to spray them with a special cleaning agent before you break out the pressure washer. But is pretreating your driveway worth the extra work and expense? Let’s dive into the pros and cons and whether it’s better to spray or not to spray before pressure washing.

What Is Pressure Washing?

Pressure washing is a deep cleaning method that removes dirt, grime, and other buildup from outdoor areas. It uses a pressurized stream of water to blast debris off of hard surfaces, including concrete, brick, and wood decking. However, pressure washing is too harsh for soft or fragile materials, such as asphalt shingles and glass.

On its own, pressure washing your driveway can be enough to get rid of dirt and debris. However, if you’re dealing with tough stains (for example, oil or paint), consider pretreating the driveway before pressure washing.

Pros of Spraying Before Pressure WashingCons of Spraying Before Pressure Washing
Helps remove difficult stainsNot guaranteed to work
Can reduce pressure washing timeCosts more

Pros of Pretreating Your Driveway Before Pressure Washing

Spraying your driveway with a pretreatment solution can make pressure washing easier and more effective. Here’s how.

Helps Remove Difficult Stains

Pressure washing alone won’t always remove stubborn paint, rust, or oil spots from your driveway. Like pretreating a stain on your clothes, however, spraying the concrete before pressure washing helps clean the surface more effectively.

Can Reduce Pressure Washing Time

Without pretreatment, getting rid of tough stains can take more time and effort. However, when you apply a special cleaning solution before pressure washing, it can make stain removal quicker and easier.

Cons of Pretreating Your Driveway Before Pressure Washing

Pretreating your driveway has some downsides, too. Here are a couple to consider.

Not Guaranteed to Work

While often effective, spraying your driveway before pressure washing isn’t guaranteed to remove all stains. If you still have stains after pretreating and pressure washing, call in a pressure washing professional.

Costs More

You’ll need to buy special cleaning solvents to tackle tricky stains with a pretreatment spray, which will increase the cost of pressure washing your driveway. You can expect to pay between $10 and $20 per bottle.

Should You Spray Before Pressure Washing?

Pressure washing concrete driveway
Photo: JJ Gouin / Adobe Stock

If you’re hoping to remove stains from your driveway, then yes—you should pretreat it with a special cleaning solution before pressure washing. However, if there aren’t any noticeable problem spots on your driveway, then pressure washing alone should be enough to clean it.

In some cases, though, it’s better to hire a pressure washing pro near you instead of tackling this project yourself—especially if you’re dealing with old or widespread stains. A pro will understand what you should spray before pressure washing and how to apply the right cleaning solutions to remove the spots effectively.

Frequently Asked Questions

It depends on the type of surface, but if you’re preparing to pressure wash a driveway, you’ll start by using a broom or leaf blower to get rid of dirt, leaves, and other debris. Then, move any nearby items (like outdoor furniture and potted plants) and cover in-ground plants with a tarp or plastic sheet. After that, you can apply degreaser spray or another pretreatment solution to any stains and scrub them with a stiff brush before pressure washing.

You should avoid using a pressure washer on any surface or item that could be damaged by the high-pressure spray, as some materials are too delicate to withstand the force.

Key items and surfaces to avoid include:

  • Electrical Components: Never pressure wash electrical systems, as water can cause short-circuits and create a safety hazard. This includes utility meters, breaker boxes, electrical outlets, generators, and HVAC or air conditioner units.

  • Delicate and Fragile Materials: Fragile items can crack, shatter, or be stripped by the pressure. Avoid pressure washing windows, glass, light fixtures, shingled roofs (especially asphalt), and stucco.

  • Painted, Stained, or Sealed Surfaces: Unless your goal is to strip the finish, do not pressure wash painted surfaces, stained wood (like decks), or anything with a protective seal that could be stripped away. Be especially cautious with older surfaces that may contain lead paint.

  • Soft Woods and Certain Decking: Delicate surfaces like softwood, composite decking, and antique or wooden patio furniture can be etched or damaged. If you must wash wood, use a lower-powered pressure washer with a wide-angle nozzle to prevent damage.

  • Living Things: Never use a pressure washer on people, pets, or plants. The force can cause serious injury and will destroy landscaping.

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