This is part of the mess I found under a Newmarket home in Brisbane. The pigeons had been left to breed and roost under the solar array for too long and the amount of decal build up was severe. It took me nearly four hours just to clean this mess. Cleaning under the panels is very difficult at the best of times but when at height with pitched roof it is not a job I relish. Get your solar panels bird proofed before this happens. It will be much cheaper.
This is not an unusual scene when pigeons are left to nest under the solar panels.
This becomes very hard to remove and quite dangerous also