We used to do a lot but a certain person who used to come on hear does have a lot of contacts and gets a lot of work he only pays 18 pence a panel so it's not financial viable, also its mind numbing to do several weeks on one large site , on some of the ones we did access was difficult with a van as the roads were very rutted , generally we only do smaller jobs now and domestic as I didn't feel it was worth the hassle on some roof mounts on farms they can be really filthy and take a lot longer to clean , I don't think it will be to long before all these big sites are cleaned using tractors with cleaning machines mounted on them we have dozens of large solar farms where I am and I've started seeing them used more instead of poling them by hand , best way to do it as far as Ime concerned , personally I would suggest forget this type of work and build up a decent window round , regular cleans , easy work , good money solar panel cleaning as it's done now is a dying business, although ss wouldn't agree as he's trying to sell it as a franchise and make a quick buck with it