Solar panel cleaning: what to know

What the job involves, what changes the price, and what to ask a pro.

What solar panel cleaning is

Solar panel cleaning washes dust, pollen, bird droppings and grime from the glass of a rooftop or ground-mounted array with soft brushes and purified water. A clean panel can produce more power, but the work must be done without scratching the glass or damaging the wiring and mounts.

Signs you need it

  • Bird droppings, pollen or dust cover the lower rows and leave dark patches on the glass
  • Your system output has dropped without a clear cause and the panels look dull or streaked
  • Dirt has built up near the frame edges where water does not run off
  • Leaves, sap or tree debris are stuck to the panels after a storm
  • The panels are in a dusty area, near farm fields or close to places where birds roost

What the pro does

  • Check the array from the ground and a safe access point, and note damage, cracks or loose mounts
  • Confirm the panel manufacturer's cleaning guidance and the warranty terms before using any product
  • Rinse the panels with low-pressure water to loosen dust and grit before any contact
  • Wash the glass with a soft brush or sponge and purified water, working from top to bottom
  • Remove bird droppings and sap with a soft tool and a cleaner that is safe for the glass and seal
  • Rinse with purified water so no mineral spots dry on the glass, and note any cracks or hot spots

What changes the price

Every job is different, so we do not publish prices. These are the things that move the quote up or down.

  • Number of panels and the total area of the array
  • Roof pitch, height and access, which decide whether the crew can work safely
  • Level of dirt, bird droppings or sap that needs extra time or product
  • Whether the array is ground-mounted and easy to reach or on a steep roof
  • Water supply, since purified water is often brought to the site
  • Whether an inspection of mounts, wiring or the inverter is included

What a written quote should spell out

  • The number of panels cleaned and whether the whole array or only part of it is covered
  • The water source and whether purified water is used for the final rinse
  • The cleaning method, brushes and products, and the manufacturer guidance followed
  • Whether a visual inspection of the panels and mounts is included, and what it covers
  • What is not included, such as roof repair, electrical work or inverter service

Questions to ask before you hire

  • Do you use purified water for the final rinse, and why does that matter for my panels
  • What do you use on bird droppings, and will it affect the glass coating or the seal
  • Will you check the panels for cracks, hot spots or loose mounts, and tell me what you find
  • How do you access the roof safely, and what equipment do you use
  • Do you follow the manufacturer's cleaning guidance and the warranty terms
  • Do you do any electrical work, or do you refer that to a qualified installer

Red flags

  • A crew that uses a pressure washer on the panels, which can crack glass or force water into seals
  • Abrasive pads, harsh solvents or household bleach on the panel surface
  • Walking on the panels or stepping on the frame during the job
  • No mention of the panel warranty or the manufacturer's cleaning guidance

What you can do yourself

You can rinse the panels with a garden hose on a low setting from the ground and wipe the frame with a soft cloth. Call a professional for roof access, for washing the glass with purified water and a soft brush, and for any panel with cracks, hot spots or loose mounts. Do not work on electrical parts or the inverter yourself.

Licenses and permits

Solar panel cleaning is not commonly licensed. Roof work and any electrical work near the array are commonly licensed, so check with your state or local licensing agency before hiring for that work or doing it yourself.

Solar panel cleaning questions

How often do solar panels need cleaning?

It depends on dust, birds and rainfall in your area. Many people clean only when output drops noticeably or when a lot of debris builds up, and a visual check after storms helps.

Does cleaning void the panel warranty?

It can if the wrong method or product is used. Ask the cleaner to follow the manufacturer's cleaning guidance and to tell you what they used.

Can I use a pressure washer?

No. Pressure can crack the glass and force water into seals. Use low-pressure water and a soft brush instead.

About this guide

This national guide is written and checked by infinibell. Rules and conditions differ by place, so local pros are credited on guides for the cities they serve, not on national ones.

Edit history

How it works

  1. 1. Describe the job

    Pick the service, add your ZIP and a sentence about what is going on.

  2. 2. Pick the pros you want

    See screened pros who serve your ZIP and choose who you want to hear from.

  3. 3. They reach out

    They contact you the way you chose: phone, email or in-app messages.

More cleaning and organizing guides

Find a pro near you

Find a pro

About this guide

Request solar panel cleaning