Exactly Richard - the frame was crappy and looked Kack but was the panel itself dirty ?
same applies in the main to conny's - the glass stays pretty clean but the framework turns green
in the long hot summer - some years ago
the self cleaning glass did get as dirty as any other kind
so it all has it's limitations
right or wrong if a customers is told by the supplier it will stay clean then thats what they believe...
either way, and whether it be solar panels, conny roof i'm up for cleaning it if the customer wants it done
Darran