PV Performance dropping...

My panels have served well for a number of years. I am now starting to see a drop off in performance. I can see the gap between Solcast forcast and actual quite different this year to last. Its not tha bad, and to be honest if I couldnt see the data I may not really notice that much

Its not hard to see why this is happening. I have quite a bit of lichen on them now. Thats obviously not going to be helping

My panels are high on my roof, too high for me to clean. Can anyone recommend a service company that can be trusted to do the cleaning, and any idea how much the service may cost?

Is it worth looking for one of the outfits that does window cleaning with the long hoses for low blocks of flats and tall houses?

^ this - great idea!

our window cleaners have a very long pole and give the panels a once over every year

I cleaned mine after the Sahara sand storm. Output Increased 5% due tot eh dust and grime removed.

TheDragon (GivEnergy) that stuff is nasty, sticks well top without scrubbing it off.