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How often does it need to be done ?
What do you use to clean them ?
Yeah except there's about 6 months of no rain in JHBunless it's covered in thick sludge or dust, the rain takes care of it.
I echo this did it one year had an extra 200-300w on peak off 6.5kw system don't bither anymoreRain gets it.
Not worth the effort for the few extra watts.