If you have never had your array serviced, it is hard to know what you are buying. A professional cleaning is a fairly quick and undramatic process, and knowing the sequence makes it easy to tell whether the visit went the way it should have.
Before Anyone Gets on the Roof
The visit starts on the ground. A crew needs to see the array from a few angles, note the roof type and pitch, count the panels, and find the water spigot and the side gate. Tile, shingle, and foam roofs each call for different footing and different care about where weight goes.
There is a short conversation at this point too. Anything you have noticed, a production drop, a noise overhead, streaking down the wall, is worth mentioning before work starts, because it tells the crew what to look at closely.
A few things on your end make the visit go smoothly:
- Unlock the side gate and clear a path to the spigot and the hose bib.
- Move vehicles out from directly under the array if your panels overhang a carport or driveway edge.
- Keep pets inside while the crew is working around ladders and hoses.
- Close any windows beneath the array, since there will be water running off the roof.
- You do not need to be home, but it helps if someone is available by phone in case the crew finds something worth a call.
Setup and the Inspection Pass
Ladders go up, the deionized water system gets connected to your spigot, and hoses are run and secured. Before any water is applied, the crew looks over the array itself: cracked or chipped glass, discoloration or hot spots on a module, loose mounting clamps, lifted flashing at a roof penetration, and any sign that something has been living underneath.
This pass matters as much as the cleaning. Most homeowners never see their own roof, so a few visits a year is the only realistic chance to catch small problems while they are still small. Whatever is found should be reported to you plainly, with a photo, whether or not it is something we handle.
The Wash Itself
The actual cleaning is less exciting than people expect, which is the point. Panels get flooded with deionized water first so the dust lifts off the surface rather than being dragged across it. Soft brush contact follows where it is needed, always on wet glass, never on dry. Then a final rinse of pure water over the whole array.
What you will not see is soap, because deionized water lifts desert dust without it. You also will not see anyone squeegeeing or towel-drying the panels. Water with the minerals stripped out evaporates leaving nothing behind, so the glass dries clear on its own. Frames and the gaps between modules get attention as well, since that is where debris collects and where runoff streaks start.
Most residential arrays take somewhere in the range of an hour to two, depending on panel count, roof access, and how long it has been since the last service. A first cleaning on an array that has never been touched takes longer than a maintenance visit on one cleaned six months ago.
The Walkthrough at the End
Before the crew packs up, you should get a look at the result and a summary of what was found. Expect a clear before-and-after, either in person or in photos if you were not home, plus any notes from the inspection and a straight recommendation on when to come back based on your specific roof rather than a generic interval.
If birds turned up during the inspection, that conversation happens now too. Cleaning an array with a colony still living under it buys a few weeks at best, so proofing the perimeter is usually the recommendation, and it can be added to a cleaning visit rather than scheduled separately.
Watch your monitoring app over the next few clear days. That before-and-after in your production data is the most concrete answer you will get about what the visit was worth. This is how every residential visit from Two Bits Solar Cleaning runs, and bird proofing can be folded into the same appointment when the roof calls for it. If you are ready for a first cleaning, request a quote and we will walk you through what your roof needs.