Why You Should Avoid Pressure Washing Solar Panels

Solar panels are a smart investment—saving you money on energy bills while reducing your carbon footprint. Naturally, you want to keep them clean so they work at maximum efficiency. But before you pull out the pressure washer, there’s something you should know: pressure washing can do more harm than good.

Here’s why you should skip the high-powered spray and choose safer cleaning methods instead.

1. High Pressure Can Damage the Glass Surface

Solar panels are built to withstand weather, but they’re not designed for the intense force of a pressure washer.

• The water pressure can crack or chip the glass.
• Even micro-cracks can reduce efficiency over time and lead to costly repairs or replacements.

2. It Can Compromise the Seal and Let Water In

Solar panels are sealed to protect delicate internal components. A pressure washer can break or loosen these seals, allowing water to seep inside.

• This moisture can cause corrosion and electrical damage, which may void your warranty.

3. Risk of Voiding the Manufacturer’s Warranty

Many solar panel manufacturers explicitly warn against using pressure washers in their maintenance guidelines. If damage occurs, repairs might not be covered—meaning you’d have to pay out of pocket.

4. You Might Scratch the Surface

Pressure washing can push tiny dirt particles across the glass like sandpaper. These scratches may be nearly invisible at first, but they can scatter sunlight and reduce your panel’s ability to generate power efficiently.

5. Safety Hazards for You

Cleaning solar panels usually involves working at heights. Adding the recoil from a pressure washer increases your risk of losing balance, falling, or causing accidental damage to the roof and panels.

The Right Way to Clean Solar Panels

Instead of pressure washing, follow safer, manufacturer-approved methods:

1. Turn off the system before cleaning.
2. Use a soft brush or sponge with a telescoping pole.
3. Rinse gently with a low-pressure hose and clean, deionized water.
4. For tough grime or bird droppings, use a mild, non-abrasive soap.

Bottom Line

Your solar panels are a long-term investment. Pressure washing might seem like a fast fix, but it can lead to permanent damage, lower efficiency, and expensive repairs. Stick to gentle cleaning methods—or hire a professional who specializes in solar panel maintenance—to keep them working their best for years to come.