Solar panels are on millions of homes and commercial buildings -- and most of them haven't been cleaned once since installation. If you're already running a pressure washing business, solar panel cleaning is one of the easiest high-margin services you can add to your menu.

The Quick Answer

Solar panel cleaning is priced per panel or per system visit. Here's what contractors charge:

Per panel: $10-$30 per panel
Residential system (20-25 panels): $150-$350 per visit
Commercial array (100+ panels): $500-$1,500+ per visit
Recurring contracts: Every 6-12 months (2x per year in dry climates)

The margins are good because most of your competitors aren't doing it. Less competition means higher prices and faster growth.

Why Solar Panels Need Cleaning

Dirty panels produce less power. Dust, pollen, bird droppings, and environmental debris coat the glass and block sunlight from reaching the solar cells.

In average US climates, soiling causes about 5% annual efficiency loss. In dusty or dry climates -- Arizona, California's Central Valley, Nevada, Texas -- that number climbs to 15-25%. On a 10 kW commercial system generating $3,000 worth of electricity per year, a 15% loss means $450 left on the table annually.

Homeowners who spent $20,000-$30,000 on solar panels care about that. When you frame cleaning as a way to protect their investment and recover lost output, the sale makes itself.

How to Clean Solar Panels Without Damaging Them

The most important rule: never use high-pressure water on solar panels. The glass surface is tempered but the junction boxes, wiring connectors, and frame seals are not built for 2,000+ PSI. High pressure can force water into electrical components and cause panel failure or void warranties.

The Right Technique

Pressure: 500-1,200 PSI max. Most pros use a soft brush attachment or water-fed pole instead of direct spray.
Water: Deionized or purified water only. Tap water leaves mineral deposits that reduce output over time. A small DI filter costs $200-$400.
Chemicals: No bleach. No acid-based cleaners. A mild pH-neutral soap or plain deionized water is all you need.
Timing: Early morning or evening. Cold water on hot panels causes thermal shock and micro-cracks.
Ground vs. roof: Ground-mounted panels are easy. Roof panels require standard safety gear -- harness, roof brackets, non-slip boots.

Who to Target

Not every neighborhood is worth chasing. Focus your efforts where the ROI case is strongest for the customer.

Best Markets

Dry, dusty climates: The Southwest and parts of California are your primary markets. Panels get dirtier faster, which means a faster payback for the customer and more frequent contracts for you.
Coastal areas: Salt spray from the ocean coats panels with residue that doesn't wash off in rain.
Areas with heavy tree cover: Pollen and bird droppings accumulate fast, especially in spring and fall.
Commercial properties: Warehouses, big-box stores, factories, and apartment buildings often have large solar arrays. One commercial account can be worth $500-$2,000 per visit on a quarterly or semi-annual contract.

Pricing Strategy

Start with per-panel pricing for residential jobs -- it's easy for customers to understand. A typical 20-panel home system at $15 per panel equals $300 per visit. With a DI water setup and soft brush, you're in and out in 45-60 minutes. That's $300 per hour, before overhead.

For commercial arrays, quote per panel or per square foot of array surface. Set a minimum of $500 on commercial jobs since setup, safety equipment, and drive time cost the same regardless of panel count.

Recurring contracts are where the real money is. Offer a 10% discount for customers who sign up for twice-yearly cleaning. A 20-panel residential system at $270 per visit x 2 visits equals $540 per year of predictable revenue.

Equipment You Already Have (and What You Need)

If you're already running a pressure washing business, you're most of the way there. Here's what's different for solar work:

DI filter: $200-$400 one-time investment. Mandatory for solar panel cleaning.
Soft brush attachment: $50-$150. A soft-bristle brush on a pole lets you clean without high-pressure contact.
Water-fed pole: $300-$800 for a telescoping pole with a brush head and water line. Makes roof panel cleaning much safer.
Roof safety gear: If you don't have a harness and roof brackets already, add them. Standard equipment for any roof work.

Total add-on investment: $550-$1,350 on top of your existing setup. You could recoup that cost in 2-3 residential jobs.

Bottom Line

Solar panel cleaning is a low-competition, high-margin add-on for any pressure washing business. Charge $10-$30 per panel, use low pressure and deionized water, and target dry climates and commercial arrays for the best returns. Most pressure washers don't offer it -- which means contractors who do are winning jobs without a fight.

If you want to make quoting solar panel cleaning packages easier, try QuoteSnap for free. Set up an instant pricing calculator for any new service and let customers book directly from your website.

Solar Panel Cleaning: High-Margin Pressure Washing Niche Service (2026)