I looked online for advice on cleaning solar panels, but everyone kept talking about getting professionals in (getting on your roof is clearly deemed a suicide mission) and using soapy water.
But what if your guttering drains into water tanks? What if you don't want to contaminate your drinking water with soap? Here's what you do.
- Turn off your solar panels at the switchboard.
- Unscrew the end cap from the gutter drain outlet so that the water you'll use to wash the panels doesn't go into your tanks.
- Get on the roof with:
- a spray bottle filled with bicarbonate of soda and vinegar mixed with water
- a plastic (non-scratch) scourer
- a window cleaner with a blade
- the hose.
As with all my exploits on the roof, this got boring pretty fast. On the other hand, the panels were putrid with black mould, lichen and moss, so as I climbed gingerly back down the ladder it was at least with some sense of accomplishment.
Unfortunately I need to get back up there post-haste, to clean the gutters themselves, but hopefully my next power bill will see me well and truly back in the black!