Why annual cleaning?
You avoid permanent yield losses.
Dirt that accumulates becomes harder to remove and can cause damage.
Annual cleaning keeps many installers’ warranty terms valid.
Rural areas (more dust and pollen)
Cities (more air pollution)
Roofs with a small pitch (water does not wash away dirt as well)
Have a specialist clean with osmosis water.
Avoid high-pressure sprays or aggressive cleaning agents yourself.
Ideally, combine cleaning with an annual technical inspection.
Conclusion:
If you take your solar panels seriously, schedule an annual professional cleaning. That way, you will remain assured of optimal performance and a long service life.
